Firefox Add-Ons:
- ColorZilla - Get colors of page elements or images, very helpful for web development
- Copy ShortURL - Quickly copies the short version of the current page's URL if one is defined, or will automatically make one using the TinyURL service. Very hand for Twitter and Facebook posts!
- Download Statusbar - Handy indicators for files that are downloading (or have been downloaded)
- Firebug - This is an indispensable Add-on for any web developer to debug client-side Javascript and much more
- FireShot - Take screenshots and easily do annotations and basic edits
- Forecastfox - Integrated weather info, very customizable
- FoxClocks - Display times in other timezones, helpful if you're working with people overseas (or are overseas yourself working with people back home)
- Live HTTP Headers - Useful tool for inspecting information being sent and returned from HTTP requests, great for web development debugging (ajax calls, etc)
- S3 Firefox Organizer - A quick and dirty Amazon S3 file manager. There are better free S3 tools out there (such as CloudBerry Explorer), but for quick things directly in Firefox, this works great.
- Tabberwocky - Provides tweaks to the way tabs are handled in Firefox
- TwitterBar - Allows quick Twitter posts directly from the URL box. It by no means replaces a regular Twitter client, but it's a great lightweight option for doing posts for the current web page you're viewing.
- Web Developer - If you're a web developer and you're not using this extension, I have genuine pity for you. Seriously, this extension provides so much functionality, it's unbelievable.
- Xmarks - An add-on that integrates with a free service to synchronize Bookmarks and/or Passwords with multiple computers. This makes keeping information the same on my different computers a breeze.
- Folderpane Tools - This extension allows for customization of the folder pane. Accounts can be rearranged and the start-up folder can be chosen.
- FoxClocks - Display times in other timezones, helpful if you're working with people overseas (or are overseas yourself working with people back home)
- Lightning - Calendar integration for Thunderbird (including iCal feeds)
- Nostalgy - If I could have ONE add-on, this would be it. Allows you to assign keyboard shortcuts to easily file mail. This saves me TONS of time and allows me to filter and file emails extremely quickly.
- Provider for Google Calendar - this pairs up with Lightning to allow Google Calendars to be added (though read-only Google Calendars via the iCal URL will work without this)
- Quicktext - this is another extension that I use daily. Provides a flexible way to create stored text strings/emails and easily use them when drafting new mails or replying. Great for customer service professionals!
- Zindus - Syncs contacts between Thunderbird and Google Contacts (or Zindus' format, but I use it for Google Contacts)