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Making Fire Fox Add-ons Compatible With Your Version of Fire Fox

Arrow Image A quick guide to fix that problem.

So with Firefox 3 fairly recently coming out a lot of your old add-ons may not be compatible any more, well here is a quick guide to fix that problem.

First off find out which add-ons are not compatible go to Tools>Add-ons

A window opens telling you what add-ons you have installed. Look for the ones that are grayed out. if you click on a grayed out one it should say 'Not compatible with Firefox 3.0.1' or what ever version of Firefox that you are using (at the time of writing this the most current version is 3.0.1.)

Now that we know which add-ons me need to update go to '' and search the add-on you have that is not compatible. Once you find the add-on click to go to the download page for that add-on.

The download button will be disabled saying that the add-ons is for an earlier version of Firefox, Use the 'User Agent Switcher' add-on to fake being the earlier version then right click the download link and click 'Save Link As...'.

Now we have the install file. Open it in any archiving app IE 7-zip, Winrar, etc. Open the file entitled 'install.rdf' in Notepad the file should look some what like this.

<?xml version="1.0" encoding="UTF-8"?>
<RDF xmlns=""
<Description about="urn:mozilla:install-manifest">
<em:name>SQL Inejct Me</em:name>
<em:creator>Security Compass</em:creator>
<em:description>An extension to test for SQL injection vulnerabilities</em:description>
<em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id> <!-- firefox -->

This is the part we are looking for:

<!-- firefox -->

Where it sayes '<em:maxVersion>2.0.0.*</em:maxVersion>' change that to '<em:maxVersion>3.0.*.*</em:maxVersion>' and save the file. A window will pop up in the archiving app saying

File 'install.rdf' was modified.
Do you want to update it in the archive?

Click 'OK'.

Now exit out of the the archiving app and right click on your '.xpi' and click 'Open With...' and select Firefox from the list of applications. If all goes well Firefox will install the add-on with out a hitch.


spywareon July 27 2008 - 23:50:37
Yeah, real compatible.
ericinsurgenton July 28 2008 - 04:08:19
haha looks like the firefox spell check doesn't work in the title field fixed
flame_1221on July 28 2008 - 06:22:43
already know it but nice article thoughSmile
mastergameron July 28 2008 - 08:09:25
BTW - Firefox 3 doesn't like you making some addons "compatible" like this, and it can fuck your profile up (it did it to me on my test profile). As always, back your shit up first Wink
Uber0non July 28 2008 - 10:16:53
This can be useful (and really works sometimes), but listen to mastergamer and backup all your addons before trying it Pfft
system_meltdownon July 28 2008 - 19:14:37
Or, use the alternative, and easier method, download the Nightly Tester Tools addon for firefox, and force compatibility...
korgon July 31 2008 - 09:04:20
Gotta agree with system on this one.
mastergameron July 31 2008 - 21:50:47
Yea me too, NTT is a really useful addon.
ericinsurgenton August 01 2008 - 06:03:09
@ system_meltdown thanks, I've never heard of that add-on.
Infopirateon October 04 2008 - 19:01:46
never heard of nightly tester tools either.. beautiful article tho before that was mentioned! lol great job fellaz.
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