Every time Firefox releases a major upgrade, we love it because it comes with lots of cool features. At the mean time, we hate it because lots of our favorite add-ons are not working with the new Firefox. Sometimes, the owners of the add-ons might be too busy, and it might take a while to release a compatible version. That’s why I put some of my favorite add-ons here. They are 100% compatible with the new Firefox, and I only modified the source codes that by-pass the version compatibly check.
In the other words, the add-on will work the way it was in the old version, and you will receive an upgrade if the owner releases a newer version.
So far I have made the following add-ons available in the latest version of Firefox:
| Add-On | Download | Comment | Author’s URL |
| BandWidthTester 0.5.9 | Download | Not tested | N.A |
| BlockSite 0.7.1.1 | Download | Tested | Add-on Homepage |
| Bookmark Duplicate Detector 0.7.5 | Download | Not tested | Add-on Homepage |
| CopyPlainText 0.3.4 | Download | Not tested | N.A. |
| del.icio.us 1.2.1 | Download | Not tested | N.A. |
| FireSheep 0.1.1 | Download Linux (Compiled from Git) |
Not tested | Add-on Homepage |
| Google Calendar Tab 3.8 | Download | Tested | N.A. |
| Multiproxy Switch 1.33 | Download | Tested | Add-on Homepage |
| PermaTabs Mod 1.93 | Download | Not Tested | Add-on Homepage |
| Snap Links Plus 1.08 | Download | Tested | N.A. |
If you need any add-on, please post in the comment below. I will try to make it available here.
Enjoy your new Firefox!
–Derrick
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24 Responses to “Add-ons for New Version of Firefox 21”
You should get PermaTabs Mod for Firefox 4!
Done. Try it.
It’s pretty buggy, and doesn’t let you do PermaTab home, but that’ just because its for FF3 probably. Thanks for uploading though!
Edit that last post (sorry for double posting), but you can do PermaTab homes, its just, you can close the permatabs as long as they are not also app tabs. Working very well, and thanks again.
thanks for the blocksite mod!
Could you get FireSheep for Beta 4?
https://github.com/codebutler/firesheep/downloads
Hi Clay,
Here you are: http://icesquare.com/download/firesheep-0.1-1-icesquare.xpi
I found that it is not stable. Try it at your own risk.
–Derrick
I can’t find any Firesheep update that works for Firefox 9. Anyone know one?
Thanks very much for keeping the BlockSite add-on updated. It keeps my teenage son focused on his school work and lets me relax…
Please try to download the Blocksite again. It works for Firefox 10.
Firesheep: Error: “ci is not defined” ….
any idea?
thanks in advance for your answer…
Firesheep does not work with Firefox 11:
ReferenceError: Cc is not defined
I have firefox 11.0, managed to install firesheep from this site… but its not working? Ive tried clicking start capturing and nothing happens… when i access preferences i get CC is not defined. any help would be nice!
Firesheep for firefox 11 is not working,when i press start capturing nothing happens.So could you please give me a link of working firesheep for firefox 11,thanks.
firesheep doesent work -.- still says not compatible or what ever….any one know any OTHER session hijackers…..for linux perferably…..
Firesheep doesn’t work with Firefox 11.
As all the other comments say, firesheep ist not working with firefox 11. would be great if u could make an update if your not to busy.. thank u
firefox v.17… firesheep isn’t working, can’t even install it- went to this site for extra support: http://www.backtrack-linux.org/forums/showthread.php?t=45708 but i don’t know how to work with Git- maybe you could? then provide the solution?
I compiled the Firesheep using git for you: http://icesquare.com/download/firesheep-Linux_x86_64-gcc3.xpi
Looks like it is designed for Linux.
I attempted to install firesheep; no luck, doesn’t download and tried on firefox 11 and 17. Now I’d like to remove the Fire Sheep logo at the top of my page…picture of the fox with the blue cap in a grassy field. (Is this the “scarlet letter”?). Anyone else with the same problem?
Firesheep
nice review. http://www.cheers4all.com but firesheep is not working
How about a compatible version of firesheep for firefox 20?