Firefox collections are groups of related add-ons assembled for easier sharing.  This idea was launched from the Firefox Add-ons site several months ago.  Since some time has passed, I thought it might be interesting to check back in with this online Mozilla feature to see which collections are the most popular out there.
Here are the most popular add-on collections for the Firefox browser:

Windows 7 Theme for Firefox 3.5
32430 subscribers – This collection of add-ons were gathered to [...]

It is no secret I am a big fan of Gina Trapani’s line of “better” add-ons for Firefox, so I can tell you I was more than excited to see that they had been rolled together as an add-on collection, so you can grab them all at once. 
Which extensions make the list?
Better Gmail 2 – Add useful extra features to Gmail, like hierarchical labels, an unread message icon on your browser tab, file attachment icons, and more.

Better Amazon -  [...]

Tired of hitting, “Next” to see the next part of any page?  No matter if you are looking through search results on Google or reading through a series of articles, the “next link” has become such an annoyance, somebody has developed an add-on for Firefox to get around it.
AutoPager is an extension that will automatically load the next page in a series of links so you have a continuous and infinite scrolling web page.  By default AutoPager works with a [...]

It is the little changes that make things better.  The devil is in the details, and when it comes to customizing some of the Web’s most popular tools, you can often make them better by combining some of the little changes out there.  Here are seven easy ways you can easily make Firefox a better browser – or at least the popular web site tools covered that you visit the most.

Better Amazon – The Better Amazon add-on for Firefox highlights [...]

  Need to make Firefox a little better you say? From Gmail to Flickr and all the neat applications in between, the “better” series of add-ons for Firefox is getting, well… better looking every single time I check them out.
Here are the list of the “better” Firefox extensions and what has come with the most recent update:
Better Gmail 2 – Version 0.5.2: Updates and fixes the Redesigned skin; Adds Hide Gmail chat script.
Better Flickr – Version 0.3: Adds Firefox [...]

I have gotten a few e-mails lately wanting me to give Better GReader a second look. Maybe I didn’t give off enough of an ecstatic glow with my last look, but this time I promise to do better!
For those of you who are not familiar with the idea, Gina at Lifehacker is a master at rolling up a lot of great Greasemonkey hacks into one big extension for Firefox adding form, functionality and style to various Google services.
Here [...]

The folks over at Lifehacker have been up to it again with creating yet another cool extension for Firefox.
Firefox only: Google Reader is one of the best web-based feed readers out there, but it could stand a few adjustments. Greasemonkey scripters have come up with a few Google Reader user scripts that make some welcome GReader tweaks like maximizing the viewing area, skipping Google’s default subscribe mechanism, and adding keyboard shortcuts.
I downloaded it the minute I saw it [...]

Want to make Gmail better? Well the folks over at Lifehacker have put together one heck of a nice Firefox extension – taking some of the best Greasemonkey scripts from around the Web. What does it do? It adds a menu of optional extra features to Gmail. To view the enabled features and get more information on each, in Firefox’s Add-ons dialog, click on Better Gmail’s Preferences dialog.

Gmail’s good, but it could be better. We’ve featured several [...]