News Feed Eradicator
What it does: completely hides your Facebook news feed. Utterly indispensable.
Unread message count hider:
What it does: a super-simple extension that hides the “(X)” by the ‘inbox’ link in GMail that tells you you have X unread messages, even when you’re not looking at the inbox. Great when you’re trying to get something else done in GMail and don’t want to be distracted by new messages coming in.