learning to use fire fox recently

I installed firefox yesterday. It's really better then IE.
Several impression features are:
1. Tab function, you can browser lots of web pages in just one windows. It's very useful when you reviewing news yesterday.
2. Lots of extension support
I installed below ones: adblock,
flashblock, the later one is more useful than the first one, I think.
turn on/off picture
right encoding
sage
tab clicking option
3. good speed

One trouble is that some nonstandard website can't be viewed rightly.