Google's
On Tuesday, the same day that one highly Google Chrome request was satisfied (meaning a Mac OS X version, though in beta), Google opened it's Chrome Extensions Gallery. This means the public can now have access to what will hopefully be a myriad of extensions, just as with Firefox. Right now, however, there are only slightly more than 300.
In order to use them, you need to use the developer version or (as they like to call it) the non-stable version of Google Chrome. It's also not quite ready for the Mac just yet. It is ready for Linux (as well, of course, as Windows).
This is what many users have been waiting for. There are so many Firefox extensions, that so many are addicted to, they have said (like me) that they would not change browsers without comparable extensions.
For me, I have a few requirements. First, an ad blocker. It seems that even though Google is king of online ads, there are even some ad blocking extensions in the Gallery. One of them, however, Adblock, which sounds very similar to the popular Firefox ad blocking extension, requires access to your Flickr account. Uh, why? Another, Adsweep, doesn't work when you download from the Chrome Extensions Gallery. It does when you download from the developer's own site, though. However, I went with AdThwart, mostly because of the reviews. It also uses EasyList for ad blocking, like Adblock Plus on Firefox.
There are two other things I really want in terms of Firefox extensions that I can find substitutes for, but not exact ones: TabMixPlus and Roboform. The only alternative to Roboform is LastPass, which works decently well, but has some issues with some of the sites I use.
Meanwhile, instead of TabMixPlus, which will allow multi-line tabs in Firefox, there is TooManyTabs. Still in pre-release and not on the Google Chrome Extensions Gallery yet. In Firefox, TooManyTabs simply adds a toolbar of tabbed sites that have been removed from memory, but are easily accessible by hitting the tab in the TooManyTabs toolbar. In Chrome, instead, TooManyTabs brings up a pane that shows the open tabs and allows you to move them to a sidebar where they are suspended. Honestly, that's a better system than in Firefox. The pane shows bitmaps of the current pages (a little buggy for now) and a red arrow shows the tab you are in.
Obviously, I am not the be-all-and-end-all of Firefox extension users, but the question you are probably wanting to ask is if I will change to Chrome? The answer is a muted yes. I would prefer to have Roboform to LastPass, but for now I will use LastPass (Roboform is supposed to be on the way).
There is, of course, a concern. Not all the Chrome extensions are written by the same developer(s) as the Firefox version, and some of them may start a project, and then give it up. In fact, this appears to be the case with AdSweep. That could be an issue in the future.
However, Firefox 3.5 crashes daily for me. I'm not the only one, as a Google search will show, and the error is the same as I see: a Visual C++ Runtime Library crash. I've grown weary of it, and realistically, Chrome is so much faster. So for now, anyway, I am switching to Chrome.