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Themes for 56.0.2? - Installation aborted because the add-on appears to be corrupt.

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Hotfix for Firefox bug 1548973 (armagaddon 2.0) mitigation is installed.

All themes tried fail with "Installation aborted because the add-on appears to be corrupt."

Hotfix for Firefox bug 1548973 (armagaddon 2.0) mitigation is installed. All themes tried fail with "Installation aborted because the add-on appears to be corrupt."
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Additional System Details

Installed Plug-ins

  • Shockwave Flash 32.0 r0

Application

  • User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0

More Information

cor-el
  • Top 10 Contributor
  • Moderator
17422 solutions 157414 answers

Themes are currently installed as an extension (XPI file) and this isn't compatible with older Firefox versions. I can load a theme that I tested in Firefox 60 ESR, but get the same error you reported in Firefox 56. I also tried the about:debugging page to load a temporarily extension that reported that it wasn't a valid extension, so you are out of luck with a direct install.

Themes are currently installed as an extension (XPI file) and this isn't compatible with older Firefox versions. I can load a theme that I tested in Firefox 60 ESR, but get the same error you reported in Firefox 56. I also tried the about:debugging page to load a temporarily extension that reported that it wasn't a valid extension, so you are out of luck with a direct install.
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