My Firefox Tips
Extensions I Use
Home
Your Profile
The Toolbars
Tab Browsing
About:config
Extensions
Extensions I Use
Blocking Ads
userContent.css
Wrapping Page
Live Bookmarks
Unrelated Page
The extension that has enhanced the way I browse the internet the most has got to be Adblock. When you type an address in your browser or click a link or bookmark you are sending a signal to a certain ip address asking for the server at that address to send you back data that your web browser then displays to you. In this data there is often codes to tell your browser to then request data from other places to fill in the objects on the page. This is why when you load up a page you will often see the background first along with the text then it takes a few seconds for the pictures or ads to fill out. Adblock can stop Firefox from downloading these extra elements and condense the page around the spot where the ad would have been. This not only makes the pages look the way you want them to it makes the page download faster since you don't have to download as much.

Adblock where you put in filters
adblock.gif
Along with other options
I also use the extension called FLST(focus on last tab). This extension's purpose is just like it's name says, if you have say, five tabs open and you are looking at the first tab then you go to the fifth tab, when you close the fifth tab Firefox will go to the fourth tab. When you have FLST enabled when you close the fifth tab it will go to the previous tab you were looking at, back to the first tab in this case.
The third extension I have installed is FireFTP. Firefox isn't a FTP client, meaning it can't upload things to a ftp server, it can download things but not upload. FireFTP allows you to have folder view and upload and download very easy.
The fourth extension I have installed is Permit Cookies. I uncheck the "Allow sites to set cookies" in the options, then if I come to a site that I want to set cookies I press alt-c and it puts that site in the cookies exception list. From then on that site will be able to set cookies until you remove it from the list in the Firefox Tools > Options.
Get to FLST options from the Extensions Manager
flst.gif
Then hit the options button
Push alt and c to permit a website

To put a cookie on your computer.

Tab Flipping is when you click a tab to see it then click the same tab and it will go back to the previous tab then click the same tab again and it will come back. Try it and you'll see what I mean.

Blocking Ads page here

Here's is a good Firefox Help Site