Add version information

ext/bg/js/settings.js

@@ -240,6 +240,8 @@ async function onFormOptionsChanged(e) {
 }
 
 async function onReady() {
+    showExtensionInformation();
+
     formSetupEventListeners();
     await profileOptionsSetup();
 
@@ -741,3 +743,16 @@ function storageSpinnerShow(show) {
         spinner.hide();
     }
 }
+
+
+/*
+ * Information
+ */
+
+function showExtensionInformation() {
+    const node = document.getElementById('extension-info');
+    if (node === null) { return; }
+
+    const manifest = chrome.runtime.getManifest();
+    node.textContent = `${manifest.name} v${manifest.version}`;
+}

ext/bg/settings.html

@@ -534,7 +534,7 @@
             <pre id="debug"></pre>
 
             <div class="pull-right bottom-links">
-                <small><a href="search.html">Search</a> &bull; <a href="https://foosoft.net/projects/yomichan/" target="_blank" rel="noopener">Homepage</a> &bull; <a href="legal.html">Legal</a></small>
+                <small><span id="extension-info"></span> &bull; <a href="search.html">Search</a> &bull; <a href="https://foosoft.net/projects/yomichan/" target="_blank" rel="noopener">Homepage</a> &bull; <a href="legal.html">Legal</a></small>
             </div>
         </div>