Original public domain code

Author: dinoboy197

amplifier.js

@@ -0,0 +1,23 @@
+(function() {
+    var amplink = document.querySelector("link[rel='amphtml']");
+    var canonical = document.querySelector("link[rel='canonical']");
+    
+    var  amp = {
+        sentinel: "__AMPLIFIER__",
+        ampurl : null,
+        canonical : null,
+        isamp : (document.querySelector("html[amp]") !== null ||  document.querySelector("html[⚡]") !== null)
+    };
+
+    if (amplink !== null) {
+        amp.ampurl = amplink.href;
+        
+    }
+    if (canonical !== null) {
+        amp.canonical = canonical.href;
+    }
+   
+    
+    chrome.runtime.sendMessage(amp);
+
+})();

amplifier128.png

@@ -0,0 +1,37 @@
+var ampTabs = [];
+
+
+chrome.runtime.onMessage.addListener(function(amp, sender, sendResponse) {
+    if (amp.sentinel === undefined || amp.sentinel != "__AMPLIFIER__") {
+      return;  //not from amplifier
+    }
+    if (amp.isamp) {
+      chrome.pageAction.setIcon({tabId:sender.tab.id, path: 'canonical.png'});
+      chrome.pageAction.setTitle({tabId:sender.tab.id, title: 'Show the Canonical version of this page'});
+    } else {
+      chrome.pageAction.setIcon({tabId:sender.tab.id, path: 'amplify.png'});
+      chrome.pageAction.setTitle({tabId:sender.tab.id, title: 'Show the AMP version of this page'});
+    }
+    if(amp.ampurl !== null || (amp.canonical !=null && amp.isamp)) {
+      chrome.pageAction.show(sender.tab.id);
+    }
+    ampTabs[sender.tab.id] = amp;
+    
+    if (localStorage["devMode"] == "true") {
+      amp.ampurl += "#development=1";
+    }
+   
+});
+
+//
+chrome.pageAction.onClicked.addListener(function(tab){
+  var amp = ampTabs[tab.id];
+  if (amp.isamp) {
+    if (amp.canonical != null) {
+      chrome.tabs.update(tab.id, { url: amp.canonical });
+    }   
+  } else {
+    chrome.tabs.update(tab.id, { url: amp.ampurl });
+  }
+});
+

amplifier48.png

@@ -0,0 +1,29 @@
+{
+  "manifest_version": 2,
+  "name": "Amplifier  AMP/Canonical switcher",
+  "short_name": "Amplifier",
+  "description": "Quickly switch between canonical and AMP version of a page",
+  "version": "0.0.5",
+  "author": "John Pettitt",
+  "icons": { 
+           "48": "amplifier48.png",
+          "128": "amplifier128.png" 
+  },
+  "background" : {
+    "scripts": ["background.js"],
+    "persistent": true
+  },
+  "content_scripts": [
+    {
+      "matches": ["http://*/*","https://*/*"],
+      "js": ["amplifier.js"],
+      "run_at" : "document_end"
+    }
+  ],
+  "page_action" :
+  {
+    "default_icon" : "switcher.png",
+    "default_title" : "AMP version not detected."
+  },
+  "options_page" : "options.html"
+}