first commit

contentscript.js

@@ -0,0 +1,37 @@
+// 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));