diff --git a/ext/bg/css/settings2.css b/ext/bg/css/settings2.css
index ea6d2816..aba72968 100644
--- a/ext/bg/css/settings2.css
+++ b/ext/bg/css/settings2.css
@@ -315,6 +315,8 @@ h3 {
 .icon[data-icon=material-right-arrow]    { --icon-image: url(/mixed/img/material-right-arrow.svg); }
 .icon[data-icon=exclamation-point-short] { --icon-image: url(/mixed/img/exclamation-point-short.svg); }
 .icon[data-icon=magnifying-glass]        { --icon-image: url(/mixed/img/magnifying-glass.svg); }
+.icon[data-icon=collapse]                { --icon-image: url(/mixed/img/collapse.svg); }
+.icon[data-icon=expand]                  { --icon-image: url(/mixed/img/expand.svg); }
 
 
 /* Content layout */
@@ -1444,7 +1446,11 @@ button.icon-button:active {
     flex: 0 1 auto;
     border-radius: 0.5em;
     transform: translate(0, var(--modal-transition-offset));
-    transition: transform 0s linear var(--animation-duration2);
+    transition:
+        transform 0s linear var(--animation-duration2),
+        width var(--animation-duration2) ease-in-out,
+        height var(--animation-duration2) ease-in-out,
+        border-radius var(--animation-duration2) ease-in-out;
     box-shadow: var(--shadow-vertical);
     display: flex;
     flex-flow: column nowrap;
@@ -1460,22 +1466,30 @@ button.icon-button:active {
     max-height: 100%;
 }
 .modal-content.modal-content-full {
-    max-width: var(--main-content-size);
-    width: 100%;
+    width: var(--main-content-size);
     height: 100%;
     transform: translate(0, 0);
     border-radius: 0;
 }
 .modal-container.modal-container-open .modal-content {
     transform: translate(0, 0);
-    transition: transform var(--animation-duration2) ease-out;
+    transition:
+        transform var(--animation-duration2) ease-out,
+        width var(--animation-duration2) ease-in-out,
+        height var(--animation-duration2) ease-in-out,
+        border-radius var(--animation-duration2) ease-in-out;
 }
 .modal-header {
     flex: 0 0 auto;
     padding: var(--modal-padding-vertical) var(--modal-padding-horizontal) var(--modal-padding-vertical-half);
+    display: flex;
+    width: 100%;
+    align-items: center;
+    box-sizing: border-box;
 }
 .modal-title {
     font-size: 1.125em;
+    flex: 1 1 auto;
 }
 .modal-footer {
     flex: 0 0 auto;
@@ -1577,6 +1591,51 @@ button.icon-button:active {
     background: transparent linear-gradient(to right, var(--dim-background-color), transparent) repeat-y;
 }
 
+.modal-header-button-container {
+    margin-top: calc(-1 * var(--modal-padding-vertical-half));
+    margin-bottom: calc(-1 * var(--modal-padding-vertical-half));
+}
+.modal-header-button-group {
+    display: block;
+    position: relative;
+    width: var(--icon-button-size);
+    height: var(--icon-button-size);
+}
+.modal-header-button {
+    position: absolute;
+    left: 0;
+    top: 0;
+    right: 0;
+    bottom: 0;
+}
+button.icon-button.modal-header-button>.icon-button-inner>.icon {
+    background-color: var(--button-icon-color-light);
+    transition: background-color var(--animation-duration) ease-in-out;
+}
+button.icon-button.modal-header-button:hover>.icon-button-inner>.icon,
+button.icon-button.modal-header-button:active>.icon-button-inner>.icon {
+    background-color: var(--button-icon-color);
+}
+.modal-header-button[data-modal-action=expand],
+.modal-header-button[data-modal-action=collapse] {
+    visibility: visible;
+    opacity: 1;
+    z-index: 1;
+    transition:
+        opacity var(--animation-duration2) ease-in-out 0s,
+        visibility 0s ease-in-out 0s;
+}
+.modal-content.modal-content-full .modal-header-button[data-modal-action=expand],
+.modal-content:not(.modal-content-full) .modal-header-button[data-modal-action=collapse] {
+    visibility: hidden;
+    opacity: 0;
+    pointer-events: none;
+    z-index: 0;
+    transition:
+        opacity var(--animation-duration2) ease-in-out 0s,
+        visibility 0s ease-in-out var(--animation-duration2);
+}
+
 
 /* Popup menu */
 .popup-menu-container {
diff --git a/ext/bg/js/settings/popup-elements.js b/ext/bg/js/settings/popup-elements.js
index 15de91e8..930f02cd 100644
--- a/ext/bg/js/settings/popup-elements.js
+++ b/ext/bg/js/settings/popup-elements.js
@@ -112,16 +112,22 @@ class Modal extends PopupElement {
             closingClassName: 'modal-container-closing',
             closingAnimationDuration: 375 // Milliseconds; includes buffer
         });
+        this._contentNode = null;
         this._canCloseOnClick = false;
     }
 
     prepare() {
-        const node = this._node;
+        const node = this.node;
+        this._contentNode = node.querySelector('.modal-content');
         let dimmerNode = node.querySelector('.modal-content-dimmer');
         if (dimmerNode === null) { dimmerNode = node; }
         dimmerNode.addEventListener('mousedown', this._onModalContainerMouseDown.bind(this), false);
         dimmerNode.addEventListener('mouseup', this._onModalContainerMouseUp.bind(this), false);
         dimmerNode.addEventListener('click', this._onModalContainerClick.bind(this), false);
+
+        for (const actionNode of node.querySelectorAll('[data-modal-action]')) {
+            actionNode.addEventListener('click', this._onActionNodeClick.bind(this), false);
+        }
     }
 
     // Private
@@ -141,6 +147,23 @@ class Modal extends PopupElement {
         if (e.currentTarget !== e.target) { return; }
         this.setVisible(false);
     }
+
+    _onActionNodeClick(e) {
+        const {modalAction} = e.currentTarget.dataset;
+        switch (modalAction) {
+            case 'expand':
+                this._setExpanded(true);
+                break;
+            case 'collapse':
+                this._setExpanded(false);
+                break;
+        }
+    }
+
+    _setExpanded(expanded) {
+        if (this._contentNode === null) { return; }
+        this._contentNode.classList.toggle('modal-content-full', expanded);
+    }
 }
 
 class StatusFooter extends PopupElement {
diff --git a/ext/bg/settings2.html b/ext/bg/settings2.html
index 002b864a..11b1b2be 100644
--- a/ext/bg/settings2.html
+++ b/ext/bg/settings2.html
@@ -1509,7 +1509,15 @@
 
 <!-- Profile modals -->
 <div id="profiles" class="modal-container" tabindex="-1" role="dialog"><div class="modal-content">
-    <div class="modal-header"><div class="modal-title">Profiles</div></div>
+    <div class="modal-header">
+        <div class="modal-title">Profiles</div>
+        <div class="modal-header-button-container">
+            <div class="modal-header-button-group">
+                <button class="icon-button modal-header-button" data-modal-action="expand"><span class="icon-button-inner"><span class="icon" data-icon="expand"></span></span></button>
+                <button class="icon-button modal-header-button" data-modal-action="collapse"><span class="icon-button-inner"><span class="icon" data-icon="collapse"></span></span></button>
+            </div>
+        </div>
+    </div>
     <div class="modal-body">
         <div class="profile-entry-header">
             <div class="profile-entry-cell"></div>
@@ -1529,7 +1537,15 @@
 </div></div>
 
 <div id="profile-conditions" class="modal-container" tabindex="-1" role="dialog"><div class="modal-content">
-    <div class="modal-header"><div class="modal-title">Profile Conditions</div></div>
+    <div class="modal-header">
+        <div class="modal-title">Profile Conditions</div>
+        <div class="modal-header-button-container">
+            <div class="modal-header-button-group">
+                <button class="icon-button modal-header-button" data-modal-action="expand"><span class="icon-button-inner"><span class="icon" data-icon="expand"></span></span></button>
+                <button class="icon-button modal-header-button" data-modal-action="collapse"><span class="icon-button-inner"><span class="icon" data-icon="collapse"></span></span></button>
+            </div>
+        </div>
+    </div>
     <div class="modal-body">
         <div class="settings-item">
             <div class="settings-item-inner">
@@ -1572,7 +1588,15 @@
 </div></div>
 
 <div id="profile-copy" class="modal-container" tabindex="-1" role="dialog"><div class="modal-content modal-content-small">
-    <div class="modal-header"><div class="modal-title">Copy Profile</div></div>
+    <div class="modal-header">
+        <div class="modal-title">Copy Profile</div>
+        <div class="modal-header-button-container">
+            <div class="modal-header-button-group">
+                <button class="icon-button modal-header-button" data-modal-action="expand"><span class="icon-button-inner"><span class="icon" data-icon="expand"></span></span></button>
+                <button class="icon-button modal-header-button" data-modal-action="collapse"><span class="icon-button-inner"><span class="icon" data-icon="collapse"></span></span></button>
+            </div>
+        </div>
+    </div>
     <div class="modal-body">
         <p>Select which profile to copy options from:</p>
         <select class="form-control" id="profile-copy-source-select"></select>
@@ -1599,7 +1623,15 @@
 
 <!-- Dictionary modals -->
 <div id="dictionaries" class="modal-container" tabindex="-1" role="dialog"><div class="modal-content">
-    <div class="modal-header"><div class="modal-title">Dictionaries</div></div>
+    <div class="modal-header">
+        <div class="modal-title">Dictionaries</div>
+        <div class="modal-header-button-container">
+            <div class="modal-header-button-group">
+                <button class="icon-button modal-header-button" data-modal-action="expand"><span class="icon-button-inner"><span class="icon" data-icon="expand"></span></span></button>
+                <button class="icon-button modal-header-button" data-modal-action="collapse"><span class="icon-button-inner"><span class="icon" data-icon="collapse"></span></span></button>
+            </div>
+        </div>
+    </div>
     <div class="modal-body">
         <div class="settings-item">
             <div class="settings-item-inner">
@@ -1682,7 +1714,15 @@
 </div></div>
 
 <div id="secondary-search-dictionaries" class="modal-container" tabindex="-1" role="dialog"><div class="modal-content">
-    <div class="modal-header"><div class="modal-title">Secondary Search Dictionaries</div></div>
+    <div class="modal-header">
+        <div class="modal-title">Secondary Search Dictionaries</div>
+        <div class="modal-header-button-container">
+            <div class="modal-header-button-group">
+                <button class="icon-button modal-header-button" data-modal-action="expand"><span class="icon-button-inner"><span class="icon" data-icon="expand"></span></span></button>
+                <button class="icon-button modal-header-button" data-modal-action="collapse"><span class="icon-button-inner"><span class="icon" data-icon="collapse"></span></span></button>
+            </div>
+        </div>
+    </div>
     <div class="modal-body">
         <p>
             These dictionaries will be used to search for definitions of the related terms when the grouping mode is
@@ -1699,7 +1739,15 @@
 <!-- Custom CSS modal -->
 <div id="custom-css" class="modal-container modal-container-left" tabindex="-1" role="dialog"><div class="modal-content-container1">
     <div class="modal-content-container2 modal-content-dimmer"><div class="modal-content">
-        <div class="modal-header"><div class="modal-title">Custom CSS</div></div>
+        <div class="modal-header">
+            <div class="modal-title">Custom CSS</div>
+            <div class="modal-header-button-container">
+                <div class="modal-header-button-group">
+                    <button class="icon-button modal-header-button" data-modal-action="expand"><span class="icon-button-inner"><span class="icon" data-icon="expand"></span></span></button>
+                    <button class="icon-button modal-header-button" data-modal-action="collapse"><span class="icon-button-inner"><span class="icon" data-icon="collapse"></span></span></button>
+                </div>
+            </div>
+        </div>
         <div class="modal-body custom-popup-css-container">
             <div class="custom-popup-css-header">Popup CSS</div>
             <textarea autocomplete="off" spellcheck="false" wrap="off" id="custom-popup-css" data-setting="general.customPopupCss" data-tab-action="indent,4"></textarea>
@@ -1716,7 +1764,15 @@
 
 <!-- Audio sources modal -->
 <div id="audio-sources" class="modal-container" tabindex="-1" role="dialog"><div class="modal-content">
-    <div class="modal-header"><div class="modal-title">Audio Sources</div></div>
+    <div class="modal-header">
+        <div class="modal-title">Audio Sources</div>
+        <div class="modal-header-button-container">
+            <div class="modal-header-button-group">
+                <button class="icon-button modal-header-button" data-modal-action="expand"><span class="icon-button-inner"><span class="icon" data-icon="expand"></span></span></button>
+                <button class="icon-button modal-header-button" data-modal-action="collapse"><span class="icon-button-inner"><span class="icon" data-icon="collapse"></span></span></button>
+            </div>
+        </div>
+    </div>
     <div class="modal-body">
         <div class="settings-item">
             <div class="settings-item-inner">
@@ -1802,8 +1858,16 @@
 
 
 <!-- Scanning inputs modal -->
-<div id="scanning-inputs" class="modal-container" tabindex="-1" role="dialog"><div class="modal-content modal-content-full">
-    <div class="modal-header"><div class="modal-title">Scanning Inputs</div></div>
+<div id="scanning-inputs" class="modal-container" tabindex="-1" role="dialog"><div class="modal-content">
+    <div class="modal-header">
+        <div class="modal-title">Scanning Inputs</div>
+        <div class="modal-header-button-container">
+            <div class="modal-header-button-group">
+                <button class="icon-button modal-header-button" data-modal-action="expand"><span class="icon-button-inner"><span class="icon" data-icon="expand"></span></span></button>
+                <button class="icon-button modal-header-button" data-modal-action="collapse"><span class="icon-button-inner"><span class="icon" data-icon="collapse"></span></span></button>
+            </div>
+        </div>
+    </div>
     <div class="modal-body">
         <div>
             <p>
@@ -1882,8 +1946,16 @@
 
 
 <!-- Anki cards modal -->
-<div id="anki-cards" class="modal-container" tabindex="-1" role="dialog"><div class="modal-content modal-content-full">
-    <div class="modal-header"><div class="modal-title">Anki Cards</div></div>
+<div id="anki-cards" class="modal-container" tabindex="-1" role="dialog"><div class="modal-content">
+    <div class="modal-header">
+        <div class="modal-title">Anki Cards</div>
+        <div class="modal-header-button-container">
+            <div class="modal-header-button-group">
+                <button class="icon-button modal-header-button" data-modal-action="expand"><span class="icon-button-inner"><span class="icon" data-icon="expand"></span></span></button>
+                <button class="icon-button modal-header-button" data-modal-action="collapse"><span class="icon-button-inner"><span class="icon" data-icon="collapse"></span></span></button>
+            </div>
+        </div>
+    </div>
     <div class="modal-body anki-card" id="anki-card-primary" data-anki-card-type="terms" data-anki-card-menu="anki-card-terms-field-menu">
         <div class="settings-item"><div class="settings-item-inner">
             <div class="settings-item-left">
@@ -1936,7 +2008,15 @@
 </div></div>
 
 <div id="anki-cards-info" class="modal-container" tabindex="-1" role="dialog"><div class="modal-content modal-content-full">
-    <div class="modal-header"><div class="modal-title">Anki Card Information</div></div>
+    <div class="modal-header">
+        <div class="modal-title">Anki Card Information</div>
+        <div class="modal-header-button-container">
+            <div class="modal-header-button-group">
+                <button class="icon-button modal-header-button" data-modal-action="expand"><span class="icon-button-inner"><span class="icon" data-icon="expand"></span></span></button>
+                <button class="icon-button modal-header-button" data-modal-action="collapse"><span class="icon-button-inner"><span class="icon" data-icon="collapse"></span></span></button>
+            </div>
+        </div>
+    </div>
     <div class="modal-body">
         <p>
             Anki card fields can be populated with information about a term or kanji character by using field markers.
diff --git a/ext/mixed/img/collapse.svg b/ext/mixed/img/collapse.svg
new file mode 100644
index 00000000..1efed703
--- /dev/null
+++ b/ext/mixed/img/collapse.svg
@@ -0,0 +1 @@
+<?xml version="1.0" encoding="UTF-8"?><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16"><path d="M5 1v4H1v2h6V1zm4 0v6h6V5h-4V1zM1 9v2h4v4h2V9zm8 0v6h2v-4h4V9z"/></svg>
\ No newline at end of file
diff --git a/ext/mixed/img/expand.svg b/ext/mixed/img/expand.svg
new file mode 100644
index 00000000..57a2bd98
--- /dev/null
+++ b/ext/mixed/img/expand.svg
@@ -0,0 +1 @@
+<?xml version="1.0" encoding="UTF-8"?><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16"><path d="M0 0v6h2V2h4V0zm10 0v2h4v4h2V0zM0 10v6h6v-2H2v-4zm14 0v4h-4v2h6v-6z"/></svg>
\ No newline at end of file
diff --git a/resources/icons.svg b/resources/icons.svg
index 2ffbaa3e..cd188ad6 100644
--- a/resources/icons.svg
+++ b/resources/icons.svg
@@ -27,11 +27,11 @@
      borderopacity="1.0"
      inkscape:pageopacity="0.0"
      inkscape:pageshadow="2"
-     inkscape:zoom="45.254834"
-     inkscape:cx="9.6656504"
-     inkscape:cy="8.7711924"
+     inkscape:zoom="22.627417"
+     inkscape:cx="3.1138994"
+     inkscape:cy="7.3363221"
      inkscape:document-units="px"
-     inkscape:current-layer="g1933"
+     inkscape:current-layer="layer46"
      showgrid="true"
      units="px"
      inkscape:snap-center="true"
@@ -1472,11 +1472,33 @@
      inkscape:label="Plus Circle Large"
      id="g1933"
      inkscape:groupmode="layer"
-     style="display:inline">
+     style="display:none">
     <path
        style="color:#000000;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:medium;line-height:normal;font-family:sans-serif;font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-feature-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:normal;word-spacing:normal;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;clip-rule:nonzero;display:inline;overflow:visible;visibility:visible;opacity:1;isolation:auto;mix-blend-mode:normal;color-interpolation:sRGB;color-interpolation-filters:linearRGB;solid-color:#000000;solid-opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:1;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;color-rendering:auto;image-rendering:auto;shape-rendering:auto;text-rendering:auto;enable-background:accumulate"
        d="M 8,1 C 4.1399291,1 1,4.1399291 1,8 c 0,3.860071 3.1399291,7 7,7 3.860071,0 7,-3.139929 7,-7 C 15,4.1399291 11.860071,1 8,1 Z M 7,5 h 2 v 2 h 2 V 9 H 9 v 2 H 7 V 9 H 5 V 7 h 2 z"
        id="circle1931"
        inkscape:connector-curvature="0" />
   </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer46"
+     inkscape:label="Expand"
+     style="display:none">
+    <path
+       style="fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 0,0 V 6 H 2 V 2 H 6 V 0 Z m 10,0 v 2 h 4 v 4 h 2 V 0 Z M 0,10 v 6 H 6 V 14 H 2 v -4 z m 14,0 v 4 h -4 v 2 h 6 v -6 z"
+       id="path1056"
+       inkscape:connector-curvature="0" />
+  </g>
+  <g
+     inkscape:label="Collapse"
+     id="g1073"
+     inkscape:groupmode="layer"
+     style="display:inline">
+    <path
+       style="fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       d="M 5,1 V 5 H 1 V 7 H 7 V 1 Z m 4,0 v 6 h 6 V 5 H 11 V 1 Z M 1,9 v 2 h 4 v 4 H 7 V 9 Z m 8,0 v 6 h 2 v -4 h 4 V 9 Z"
+       id="path1065"
+       inkscape:connector-curvature="0" />
+  </g>
 </svg>