In my day-to-day work I need to effectively use Firefox to search in the web, follow up discussion list in my web mail, save some awesome links, and others things. To accomplish this tasks I also have installed amazing Add-ons that improve my performance to the next level 
They are:
- FireGPG is a Firefox extension under which brings an interface to encrypt, decrypt, sign or verify the signature of text in any web page using GnuPG. FireGPG adds some features to the Gmail interface, to let you use GPG’s features directly in your webmail for both, to sign and to detect PGP blocks in a page (for example a public key), and lets you easily manage these different blocks.
- Delicious Bookmark is a social bookmarking service that allows users to tag, save, manage and share web pages from a centralized source. With emphasis on the power of the community, browse bookmarks on just about anything from the best programming tips to the most popular travel sites, all in an easy to read format and with a lot of human factors.
- Adblock Plus is the bad boy of the Firefox Add-ons. Before Adblock born, We are annoyed by all those ads and banners on the internet that often take longer to download than everything else on the page, after Adblock we could get rid of them. Right-click on a banner and choose “Adblock” from the context menu — the banner won’t be downloaded again. Maybe even replace parts of the banner address with star symbols to block similar banners as well. Or choose a filter subscription, then even this simple task will usually be unnecessary: the filter subscription will block most advertisements fully automatically.
- Extended Copy Menu is a simple Add-on that provide the option to copy a selected text into a page as to format to use when past back: plain text or html. Very simple to use.
- Gmail Notifier allows checking for new Gmail messages for multiple Gmail accounts directly from the browser’s UI. A status bar item will show once installed, and a toolbar item can be added by customizing the toolbar.
- TinyUrl Creator extension brings the http://tinyurl.com functionality closer to your fingertips. It will convert a long URL into a smaller, more manageable one which is easier to share through email and instant messenger. When you access the new “tiny” URL in your browser it will automatically send you to the original one.
- Wired-Marker is a permanent (indelible) highlighter that you use on Web pages. The highlighter, which comes in various colors and styles, is a kind of electronic bookmark that serves as a guide when you revisit a Web page. The highlighted content is automatically recorded in a scrapbook and saved.
And what I’m look for? hum, let me see… ok, I know one: I would like an Add-on to effective use of http://pastebin.com/ during the collaborative debugging process. If you know one, please insert your suggestion into the comment 
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