Ever wanted to upgrade to the latest
FireFox to see what's new and improved, but didn't because of compatibility issues with your
precious firefox extensions? Well, instead of waiting on the
author to update the extension, how about you get off your lazy ass and fix it yourself.
First off, let me say that I have only tried this with about a dozen extensions, so I take no responsibility if you screw your FireFox to hell.

Every extension I have edited has worked though, so it should work for most, if not all, other extensions.
Ok, so here we go.
Step 1

Download your extension to your hard drive. You know like: Right Click>Save As.
Step 2

Once downloaded go to the folder in which you saved the .xpi extension and open it. Choose
WinRAR to open the file. If you already have this (.xpi) filetype registered with another program then use "Open With".
Step 3

Now extract the
install.rdf file to your computer. Leave WinRAR open for later use.
Step 4

Now open the
install.rdf with NotePad. You should see something like this:
- Code: Select all
<?xml version="1.0"?>
<RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:em="http://www.mozilla.org/2004/em-rdf#">
<Description about="urn:mozilla:install-manifest">
<em:id>{cd2b821e-19f9-40a7-ac5c-08d6c197fc43}</em:id>
<em:version>0.8.1</em:version>
<em:targetApplication>
<Description>
<em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
<em:minVersion>0.9</em:minVersion>
<em:maxVersion>0.10</em:maxVersion>
</Description>
</em:targetApplication>
<em:name>FLST</em:name>
<em:description>Focus Last Selected Tab</em:description>
<em:creator>Daniel Lindkvist</em:creator>
<em:iconURL>chrome://flst/content/gorgias.png</em:iconURL>
<em:optionsURL>chrome://flst/content/prefDialog.xul</em:optionsURL>
<em:homepageURL>http://gorgias.de/mfe/</em:homepageURL>
<em:file>
<Description about="urn:mozilla:extension:file:flst.jar">
<em:package>content/flst/</em:package>
</Description>
</em:file>
</Description>
</RDF>
Step 5

If you look closely above you will see the value
<em:maxVersion>0.10</em:maxVersion>. So now all you need to do is change the
0.10 to whichever version you are using (or just put something like 1.9

). After you changed the version number then save the file and close it.
Step 6

Go ahead and go back to the WinRAR window you left open and drag the newly modified
install.rdf into WinRAR. You should now have an
Archive Name and Parameters window pop up inside of WinRAR. Make sure
Add & Replace Files is selected and hit ok. Exit WinRAR.
Step 7

Open that damn modified extension with FireFox and install.