[Platinum]

FireFox Most Popular List
Recommended addons
All addons


Please understand that there's going to be multiple sections of plugins. Therefore I have added all the lists into spoiler to make it more organised.
Please report any broken links/images you find.


--------- LIST THAT I APPROVE ---------
If you want an addon added just comment!
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COMMON / GENERAL ADD-ONS
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Spoiler:

AdBlockPlus - Get It Here
Great addon that blocks pretty much EVERY advertisment that is not needed for you. It's so good that it doesn't block the things you don't want it to, automatically.

DoNotTrackMe - Get It Here
An addon that cares about your privacy, it will notify you of any companies tracking you such as Google, AdSense, Youtube and also much smaller companies.

DownThemAll - Get It Here
An advanced dowload that adds new advanced download capabilities to your browser. (increases speed up to 400%)

Empty Cache Button - Get It Here
A simple button that clears FF's cache with a singe click.

Gmail Notifier - Get It Here
An add-on that will notify when you get new mails. No need to login / enter credentials, all automatic. Recommended if you use Gmail.

Google Privacy - Get It Here
This add-on shows tracking-free links or optionally replaces the results with those links.

ProxTube - Get It Here
Always had trouble with youtube videos being blocked in your country? This add-on blocks the block!

ReloadEvery for FF - Get It Here
Ever wanted the same automatic reloads just like Opera does? Get it add-on!

RightToClick - Get It Here
Sick of the stupid javascripts that disallow you from rightclicking, text selection, drag & drop etc? Get this add-on to re-allow!

Save Text to File - Get It Here
With this add-on you can save any highlighted text to a file on your computer.

Self-Destructing Cookies - Get It Here
Ever wanted an automatic cookie cleaner? This add-on does the job! Any unwanted cookies will explode in your browser!

URL Fixer - Get It Here
Do you also have these stupid typo's like codecommunity.cmo or codecommunity,com ? This add-on automatically fixes those typo's!

Youtube Audio, Video and Subtitle downloader - Get It Here
This add-on will get ALL available downloads for a youtube video, no matter if it's subtitles audio or the video itself!

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HACKING/HIJACKING/EDITING ADD-ONS
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Spoiler:

GreaseMonkey - Get It Here
Customize the way a web page displays or behaves, by using small bits of JavaScript.

HackBar - Get It Here
This add-on will help you in testing sql injections, XSS holes and site security. It is NOT a tool for executing standard exploits and it will NOT teach you how to hack a site.

Firebug - Get It Here
Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.

Firesheep - Get It Here
Firesheep is a new and innovative addon which allows you to hijack HTTP sessions of users sharing the same network.

Add `N Edit Cookies - Get It Here
Cookie Editor is an add-on that allows you to add and edit "sessions" and saved cookies.

XSS Me - Get It Here
XSS-Me is the Exploit-Me tool used to test for reflected Cross-Site Scripting.

SQL Inject ME - Get It Here
SQL Inject Me is the Exploit-Me tool used to test for SQL Injection vulnerabilities.

Tamper Data - Get It Here
Use tamperdata to view and modify HTTP/HTTPS headers and post parameters, trace and time http response/requests and security test web applications by modifying POST parameters.

HackTheWeb - Get It Here
Add-on to edit/modify webpages and their behaviour.

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WEB-DEVELOPMENT ADD-ONS
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Click here to see the full section.

Spoiler:

Better Privacy - Get It Here
Better Privacy serves to protect against special longterm cookies, a new generation of 'Super-Cookie', which silently conquered the Internet.

TableTools2 - Get It Here
Does everything for HTML tables: Copy (table/row/column/cell), Sort (multi-column), Search (regex, range operations ...), Filter, Chart (bubble, line, pie, histogram ...), Statistics, Rearrange (column/row), Combine & Compare. Replaces TableTools.

View Source Chart - Get It Here
Inspect webpage source code at lightning speed.

Word Count Tool - Get It Here
Counting the number of words, characters without any extra clicks. Just select the text and the statistics is shown in the status bar widget. It also gives detail report about the numbers of sentences, paragraphs, average lengths, keyword density...

Browser Server - Get It Here
This addon is a substitute to "POW Webserver". It lets you entertain files on your computer and let others surf to them.

FireFTP - Get It Here
FireFTP is a free, secure, cross-platform FTP/SFTP client for Mozilla Firefox which provides easy and intuitive access to FTP/SFTP servers.

Flagfox - Get It Here
Shows a flag of the locaton that the current server has and offers multiple tools such as sitesecuritycontrol, whois, translation, validation, url-shortening and more...

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Please understand that there's going to be multiple sections of plugins. Therefore I have added all the lists into spoiler to make it more organised.
Please report any broken links/images you find.