Firefox Addons: Kolekto Ailanta
Google Chrome Extensions
W3C Core Styles
W3C Core Styles Sampler
La movado por nerigardilospecifa TTT
The Campaign for a Non-Browser Specific WWW
As of release 3.0.4, Firefox is available in Esperanto!
If you want to have more languages in your Firefox than just the one that you installed...
Language packs at mozillaZine has some more info about language, locale, profiles, and commandline switches. And instead of using a locale switcher, you can surf to about:config and change the value of general.useragent.locale to the desired language code (If you make a mistake or haven't installed the relevant language pack, Firefox will default to the langauage of the version you installed).
This page used to be mostly about Opera, praise and tips and tricks and such. I was an Opera fanatic around the turn of the millennium, and a registered user. It was small, fast, (allegedly) standards compliant, and had many handy features not found in other browsers. It was also buggy and crashed a lot, but we fans loved it anyway. But then Opera got big and bloated like the other browsers, changing to be more like them in a grab for market share I guess. And I found that its standards compliance wasn't much better than that of the others, in some ways worse; I guess standards compliant for Opera just meant no extensions. (Sometimes their "compliance" seemed more like a misunderstanding of the English language standards documentation, noted in some of my email exchanges with them!) So I stopped using it as my development testbed, and then used it less and less for casual browsing too as time passed. By the time I removed Opera from the last machine on which I had installed it (April 2005), it still hadn't become reliable enough for me to use when I absolutely needed something to work (online banking and shopping, for example).
So that's why this page is pretty empty now. I cleared out all my Opera praise and rants, and tips that mostly didn't matter anymore. I did give Opera another chance later anyway, when I needed an IRC client. Worked okay, but then I dumped it again. Used Internet Explorer for a while, then switched to SeaMonkey, then to Firefox after I overheard some coworkers talking about Firebug...
And I still like Firefox for the extensions, but tried Chrome when it appeared. At first I didn't like Chrome; seemed like one of the things that made it "faster" was that it gave up too soon! For example, pages would stop rendering with images incomplete, just the top third of each displayed. But they fixed that, and I started using Chrome for more and more for general surfing, switching back to Firefox when I needed some particular extension.