first commit

background.js

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+chrome.runtime.onInstalled.addListener(function() {
+    // chrome.storage.sync.set({color: '#3aa757'}, function() {
+    //   console.log("The color is green.");
+    // });
+  });

contentscript.js

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+// document.body.style.border = "15px solid red";
+
+/* TODO
+ - Pop-up should be dismissable
+ - Once dismissed, popup should not be shown. Use cookies or localStorage for this
+ - List of alternatives should be loaded from a user-specified external source. Can be modified via extension options.
+ - Pop-up should be formatted to look better
+*/
+
+BETTER_ALTERNATIVES = [
+  [ /https?:\/\/(www.)?google.com\/chrome/ , "A better alternative is <a href='https://mozilla.com' target='_blank'>Mozilla</a>."]
+]
+
+function findBetter(url) {
+    var match = BETTER_ALTERNATIVES.find(pattern => url.match(pattern[0]));
+    if(match)
+        return match[1];
+    else return null;
+}
+
+function showBetter(alternative) {
+    if(!alternative) return;
+    let betterdiv = document.createElement("div");
+    betterdiv.style.backgroundColor = "yellow";
+    betterdiv.style.color = "red";
+    betterdiv.style.position = "fixed";
+    betterdiv.style.bottom = "10px";
+    betterdiv.style.right = "10px";
+    betterdiv.style.width = "400px";
+    betterdiv.style.height = "200px";
+    betterdiv.style.textAlign = "center";
+    betterdiv.style.fontSize = "20px";
+    betterdiv.innerHTML = alternative;
+    document.body.appendChild(betterdiv);
+}
+
+showBetter(findBetter(document.location.href));

manifest.json

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+{
+    "name": "Better",
+    "version": "0.1",
+    "description": "Find better products & services than the one you're currently visiting",
+    "permissions": ["activeTab"],
+    "background": {
+        "scripts": ["background.js"],
+        "persistent": false
+      },
+    "content_scripts": [
+        {
+            "matches": ["https://*/*", "http://*/*"],
+            "js": ["contentscript.js"]
+        }
+    ],
+    "manifest_version": 2
+  }