Add-ons

DownThemAll! by Nils Maier, Federico Parodi, others

The first and only download manager/accelerator built inside Firefox!

FlashGot Mass Downloader by Giorgio Maone

Download all the links, movies and audio clips of a page at the maximum speed with a single click, using the most popular, lightweight and reliable external download managers.

Saved Password Editor by Daniel Dawson

Adds the ability to create and edit entries in the password manager.

User Agent Switcher by chrispederick

The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.

MinimizeToTray revived by Nils Maier

Minimizes windows into the system tray.

Collector's Note Minimises Firefox to tray instead of closing it. But I prefer another addon called "Tray Hotkey" which also allows you to set the transparency of a firefox window; A function that you can use to view youtube videos in another browser as you use a transparent FF window on top of it.

QuickNote by Leszek Życzkowski, Jed Brown, others

A simple note-taking extension.

Collector's Note Stores your notes locally on your computer.

Session Manager by Michael Kraft

Session Manager saves and restores the state of all or some windows - either when you want it or automatically at startup and after crashes. It can also automatically save the state of open windows individually.

Collector's Note You can also use Tab Mix Plus's Session manager instead of this. But the advantages of Session manager are 1. More powerful, Stores more sessions 2. If you also have the addon "Session Manager Export tool" then you can export and save your sessions.

Fire IE (FireIE, Enhanced IE) by Yuan Xulei(袁徐磊), patwonder

Embeds Internet Explorer(IE) to use the powerful Firefox add-ons.
Not only an enhanced IE Tab, but also an enhanced Internet Explorer with Adblock Plus and FireGestures support.
Switch to the IE engine in one click and dismiss your IE.

UnMHT by arai_a

UnMHT allows you to view MHT (MHTML) web archive format files, and save complete web pages, including text and graphics, into a single MHT file in Firefox/SeaMonkey.

Diccionario español México by eduardo_moreno

Diccionario para México.

Color Transform by Peter J. Sloetjes, MSc.

Transform the colors of entire web pages or selected elements. Combine predefined themes with basic transforms. Save transforms for specific web domains.

Collector's Note In this list you will find the following addons to alter the look of a webpage 1. Color Transform 2. Blank Your Monitor 3. Textise 4. Column Reader 5. Tranquility 6. Readable. 7. No Squint Out of these BLANK YOUR MONITOR is my favourite because it is extremely fast at transforming the appearance of a page. It changes the page as per your settings within an eyeblink of your pressing the button. COLOR TRANFORM is almost equally fast, it has the advantage of being a lot more customisable; But Color Transform requires you to click on its button twice(rather than once like Blank your monitor) i.e once to open the pop-up that lists the various kinds of layouts you can choose, the second time to select a layout. TEXTISE simply gives you a text-only version of a webpage which is useful if you want to save a webpage, but you can also use it to improve the readability of the page. COLUMN READER: If you read extremely long wikipedia articles, you will like Column Reader. For simple one or two pages long articles you should use either TRANQUILITY or READABLE..... Column Reader, Tranquility and Readable all take a longer time than the other addons to remove the clutter from a webpage. Column Reader takes the longest time, but improves readability the most from among Column Reader, Readable and Tranquility - this is why its time consuming transformation is worth it only on longer pages and research articles. 7. NO SQUINT: Allows you to zoom in/out of a page. What is special about it is that you can zoom the page separately and zoom the font size of the text separately and Save the settings!. So you can enlarge the text more than you enlarge the images if you so desire. The ability to save website specific settings is unique to No Squint from among the 7 addons I have described. [My preference: Use Blank your Monitor for small pages and Column Reader for longer pages like Research papers etc.. Blank your monitor is sufficient for most purposes once you have customised a webpage using No Squint and saved the settings]

DownThemAll! AntiContainer by Nils Maier

Make the resources behind container pages easily downloadable by DownThemAll!

Mozilla Archive Format, with MHT and Faithful Save by Christopher Ottley, Paolo Amadini

— Open web pages saved with Internet Explorer or other browsers (MHT)
— Save many tabs, video and audio reliably, in a single ZIP file (MAFF)
— Return to the original site you saved a page from, and more!

ReminderFox by Tom Mutdosch, Daniel Lee, others

ReminderFox displays and manages lists of reminders and tasks. ReminderFox uses easy-to-use lists with warnings/alarms to remind you of all your important appointments.
Synchronize ReminderFox with other calendars as well.

AutoProxy by lovelywcm

Are you concerned about your privacy? Or, are you blocked from some websites by a firewall? And, are you arming yourself with a proxy? In that case, AutoProxy is designed for you! A tool to help you use your proxy automatically & efficiently.