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Installing extensions from a file is supported in the latest mainline FF (84.0.2), nightly or dev are not required. I currently have one installed. It just show

• bovine3dom 6y ago
  This is true but misleading: the extension you install from file has to be signed by Mozilla in exactly the same way that extensions on the store are signed.
  • Arnavion 6y ago
    You can remove the signature requirement on stable by setting `xpinstall.signatures.required` to `false` in your user.js / about:config (I wrote most the extensions I installed for my own bespoke use, built locally as zip files and installed via "Install Add-on From File...", and I don't have a problem trusting myself.)
    • bovine3dom 6y ago
      I don't think this is is true for the official Mozilla builds (except for Nightly, Beta and unbranded). It's possible that your distro has a custom build that allows the setting. Arch builds Firefox with `--allow-addon-sideload` which could be the culprit.
      • Arnavion 6y ago
        Ah indeed. My distro also builds with `--allow-addon-sideload`
        • bovine3dom 6y ago
          No promises that that's actually the right flag. I had a rummage around searchfox and it looks like that just enables extensions that have been placed in special directories (whether they must be signed or not is a different flag). There clearly is a setting somewhere though as the unbranded builds exist...