Most secure and useful browser extensions

Some of my favorite browser extensions require access to “Your data on all websites” or “All data on your computer and the websites you visit”. Technically this means that I grant the developers of such extensions full access to my entire communication with all websites I visit, including login sessions (cookies, password, etc.), private data (docs, e-mails, photos, etc.) even online banking credentials or credit card info – and for some single extensions even worse – to all data on my computers.

Even Google warns not to grant these rights to third parties:
http://www.google.com/support/chrome_webstore/bin/answer.py?answer=186213

In the future I will only trust extension authorities, which can access my data on their own domains anyway (like Gmail extension for mail.google.com) or install a few necessary extensions only.

Here’s my trusted list for secure and useful browser extensions.