diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..4a061df
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,19 @@
+# CONTRIBUTING
+
+## Prerequisites
+
+* Node.js
+* Typescript (`npm i -g typescript`)
+
+## Compiling
+
+* Run `tsc` in the `extension` directory, or `tsc --watch` for auto-compilation when you make changes to the codebase
+
+## Testing
+
+These instructions are for Chromium-based browsers only (Chrome, Edge, Brave, Vivaldi, etc.), instructions for Firefox would be appreciated. Make sure to have compiled your code first. If using live reloading using `--watch`, you will *still* have to manually reload the extension in the Extensions window for any changes to be picked up by the browser.
+
+* Open [chrome://extensions](chrome://extensions)
+* Enable "Developer mode"
+* Click "load unpacked"
+* Select the `extension` directory
diff --git a/extension/background.ts b/extension/background.ts
index 743efe4..32621e8 100644
--- a/extension/background.ts
+++ b/extension/background.ts
@@ -272,6 +272,7 @@ const badIdentifiersArray = [
     'tmblr.co',
     'tumblr.com',
     'twitch.tv=SN',
+    'tweetdeck.twitter.com',
     'twitter.com',
     'twitter.com/explore',
     'twitter.com/hashtag',
diff --git a/extension/content.ts b/extension/content.ts
index 0f86d82..7cbf62b 100644
--- a/extension/content.ts
+++ b/extension/content.ts
@@ -4,7 +4,7 @@ var hostname = typeof (location) != 'undefined' ? location.hostname : '';
 if (hostname.startsWith('www.')) {
     hostname = hostname.substring(4);
 }
-if (hostname == 'mobile.twitter.com') hostname = 'twitter.com';
+if (hostname == 'mobile.twitter.com' || hostname == 'tweetdeck.twitter.com') hostname = 'twitter.com';
 if (hostname.endsWith('.reddit.com')) hostname = 'reddit.com';
 if (hostname.endsWith('.facebook.com')) hostname = 'facebook.com';
 if (hostname.endsWith('.youtube.com')) hostname = 'youtube.com';