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How do I re-enable a theme that works in Firefox version 49.x? I changed the max version in the rdf file and it didn't work.

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Red Cats, Blue Flavor. I've been using it for years and it's the only theme for me. How do I fix it? The default theme is boring.

Red Cats, Blue Flavor. I've been using it for years and it's the only theme for me. How do I fix it? The default theme is boring.

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It's up to the writer of the theme to keep it compatible with current versions of Firefox. Contact its support.

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The developer of Red Cats (blue flavor) has a support thread over here: http://forums.mozillazine.org/viewtopic.php?f=48&t=2838491&start=180