Well, I hate to make this about FF, but let's have it.
Those issues in the link you gave, are not all FF4 related, as many of those issues are present in 3.5 also, so I see no reason for you not to upgrade. Those issues are about the programming part in web developer tools, not about how good or bad FF is.
Opera has the fastest JS engine... when it works. Opera has the Dragonfly... to look pretty. Nowadays, Opera is trying the Google-ways with the dev bar it has. Opera can't tell you don't bloody want the Speed dial or some other default tab to be opened as well when you open a page "Open with Opera" way.
And many more. Again, if Opera was so good, it would rise above its 2%. It's not a big conspiracy against it. I gave it a try. I tried all big5. I thought Ch was better than IE. In some ways it is. But FF is better. And Opera and Safari expect to be courted like little princesses when they should work like coal miners: hard and in the front lines.
You complain FF lets you use so many extensions it freezes. Well, I merely use 3 or 4. That's about as many as you can find for Opera.
Yous should learn JS not for the reason of not using jQuery, but for the reason of customizing and improving your own version of jQuery. Programming is about productivity. Building from the ground up each and every time is not productive. Using libraries is the way to go.
Originally Posted by rctneil
If size matters, be smart. jQuery is modular, take what you need from it, if not all. Use it, it's cacheable, you won't spend more bandwidth on it than on a medium size image.
jQuery is a community effort and hard work. Respect that. jQuery's code can be contributed. Don't stand on the side lines complaining, contribute if you think you can make it better.