Add firefox extension

README.md

@@ -12,12 +12,22 @@ This was originally a [Tampermonkey](https://www.tampermonkey.net/) userscript b
 
 Copy [script.js](./script.js) into Tampermonkey.
 
-## Chrome extension
+## Browser Extensions
 
-To load the browser extension, clone this repo and load [extensions/chrome](./extensions/chrome/).
+The browser extensions are currently not packaged or published anywhere.
+
+### Chrome
+
+To load the chrome extension, clone this repo and load [extensions/chrome](./extensions/chrome/).
+
+### Firefox
+
+To load the firefox extension, clone this repo and load [extensions/firefox](./extensions/firefox/).
+
+Go to `about:addons`, and ensure that all permissions are granted. If this is not done, the extension will not have permission to execute content scripts.
 
 ## Updating redirects
 
-The chrome extension will update itself by periodically fetching the latest [redirects.json](redirects.json).
+The browser extensions will update the list of redirects by periodically fetching the latest [redirects.json](redirects.json).
 
 Open a pull request to this repo to update the redirects.

extensions/firefox/background.js

@@ -0,0 +1,18 @@
+function updateRedirects() {
+  var URL =
+    "https://raw.githubusercontent.com/davegallant/rfd-redirect-stripper/main/redirects.json";
+
+  fetch(URL)
+    .then((res) => res.json())
+    .then((res) => {
+      browser.storage.local.set({
+        "rfd-redirects": res,
+      });
+    });
+}
+
+chrome.runtime.onInstalled.addListener(() => {
+  updateRedirects();
+});
+
+setInterval(updateRedirects, 1 * 60 * 60 * 1000);

extensions/firefox/content.js

@@ -0,0 +1,32 @@
+function stripRedirect(URL, redirectRegex) {
+  for (var i = 0; i < redirectRegex.length; i++) {
+    var rule = redirectRegex[i];
+    var result = new RegExp(rule.pattern).exec(URL);
+
+    if (result) {
+      var newURL = result.groups.baseUrl;
+      try {
+        return decodeURIComponent(newURL);
+      } catch (e) {
+        console.log(e);
+        return URL;
+      }
+    }
+  }
+
+  return URL;
+}
+
+function stripRedirects() {
+  var Links = document.querySelectorAll("a.postlink, a.autolinker_link");
+
+  browser.storage.local.get("rfd-redirects", function (redirectRegex) {
+    Links.forEach(function (Link) {
+      var ReferralURL = Link.href;
+
+      Link.href = stripRedirect(ReferralURL, redirectRegex["rfd-redirects"]);
+    });
+  });
+}
+
+stripRedirects();

extensions/firefox/manifest.json

@@ -0,0 +1,21 @@
+{
+  "manifest_version": 3,
+  "name": "rfd-redirect-stripper",
+  "description": "Strip tracking redirects on rfd",
+  "version": "0.1",
+  "content_scripts": [
+    {
+      "matches": ["*://forums.redflagdeals.com/*"],
+      "js": ["content.js"],
+      "run_at": "document_end"
+    }
+  ],
+  "action": {
+    "default_icon": "icon.png"
+  },
+  "background": {
+    "scripts": ["background.js"]
+  },
+  "permissions": ["scripting", "storage"],
+  "host_permissions": ["*://forums.redflagdeals.com/*"]
+}