How is the plugin compatible with version 52

Add-ons
10
  1. Unfortunately, it looks like strict_min_version must be at least 58.0, and this is intentional:
    Error "Lowest supported "strict_min_version" is 58.0" - #5 by dotproto
    However, @dotproto suggests two workarounds at the end of his post.
  2. There’s a note in the browser_specific_settings.strict_min_version documentation:

Note: The minimum supported version capable of receiving updates is 115.0 (ESR) or, if ESR versions are not included, 128.0. This is due to the expiration of the root certificate in Firefox in March 2025. As a result, older versions of Firefox don’t recognize extension signatures. See Update Firefox to prevent add-ons issues from root certificate expiration for more information.