1. Click on the 'add to firefox' grey button 2. RIGHT click on the 'install anyway' button, and save the XPI file somewhere. 3. Open the XPI file with a Zip manager application (or rename the file to .zip - remember to rename back to .xpi before step #7) 4. Extract the file 'install.rdf' and open with Notepad or a text-editor. 5. Change the value inside the tag 'em:maxVersion' to 42.* 6. Save install.rdf, and put back inside the XPI file 7. Drag and drop the XPI file onto Firefox, and install as normal.
Optional: The Firefox settings page doesn't work properly with this version of MZ8, to fix that, go to About:Config in the Firefox address bar and search for 'browser.preferences.incontent' and set that to 'False'. (this moves the settings page back into a popup dialog, like earlier versions of Firefox)
Disclaimer: I am not the author of MZ8, but a user who wishes it to be the default theme for FF on Windows 8. Please use the above instructions at your own risk - I am not liable for any damage you do to your installation of Firefox.
Nice theme, however it does not seem to be compatible with the latest FF 38.0.5. It breaks the settings page (nothing can be clicked) and breaks search engine selection in the toolbar under windows 7. Tried to find support info, but could not find any concoct info.
I used an older version of this theme before Firefox 29 came around. I really like the clean, fresh look of it. Unfortunately I hate the newest Firefox and have stayed on a slightly older version of Firefox.
What happened to the older versions of MZ8 that worked with Firefox 28 and older?