Someone in a later post mentioned "patching the install.rdf in the .xpi". This, in fact, should resolve this particular issue.Scarlettrunner20 wrote:Fx 40 is incompatible with Red Cats and is disabled by Mozilla before the upgrade finishes...
In case you don't know how to do it:
1. Close Fx.
2. Go into your profile and find Red Cats in the "extension" folder ({dd30bf68-268a-4815-ad48-8740b774c764}.xpi)
3. Open the .xpi file using WinZip or something similar.
4. Inside the xpi file you'll see "install.rdf"; open it with a text editor.
You'll see the following
---------------------------------------------------------
<?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>{dd30bf68-268a-4815-ad48-8740b774c764}</em:id>
<em:version>5.8.0</em:version>
<em:type>4</em:type>
<!-- Target Application this extension can install into,
with minimum and maximum supported versions. -->
<em:targetApplication>
<Description>
<em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
<em:minVersion>4.0</em:minVersion>
<em:maxVersion>49.*</em:maxVersion>
</Description>
</em:targetApplication>
<!-- Front End MetaData -->
<em:name>Red Cats (green flavor)</em:name>
<em:description>There can never be too many cats! Turn your Firefox into Firecat and enjoy browsing in the furry company. The theme is also available in blue flavor.</em:description>
<em:creator>Red_Fat_Lazy_Cat</em:creator>
<em:contributor>Karlchen (Windows/Linux beta test)</em:contributor>
<em:contributor>Nat Oldenburg (Windows/Linux beta test)</em:contributor>
<em:contributor>NeoLotus (Mac beta test)</em:contributor>
<em:contributor>Ritsuka (Windows beta test)</em:contributor>
<em:homepageURL>http://www.bluecatsgraphics.com/Firefox_Themes/</em:homepageURL>
<!-- Front End Integration Hooks (used by Theme Manager)-->
<em:internalName>RedCats_g</em:internalName>
</Description>
</RDF>
---------------------------------------------------------
5. In the line marked in red above, your file probably says "maxVersion>39.*", or something like this.
Change the number to 49.* (or, as the other poster did, to 99.*).
6. Save the file.
You should be good to go.
I hope this helps.