BlackPlatypus

Heheh, more like they've taken it OFF support - but anyways, have you seen the way to install Mozilla's intermediate certificate on older versions? It seems like that one actually solves it! :)))

https://www.reddit.com/r/firefox/comments/bkspmk/addons_fix_...

In the mean time, installing the hotfix extension and running the script seems to help :)

Oh, thank you for the pointer in the right direction! In the mean time, I was just glad to have any way to use my browser again!

This does not work for FF versions older than v57.

I use v56.0.2 because that was the last time we actually got to customize the browser (yes, boo me for using an old version).

So I dug around a little (okay, a lot) and worked out a solution for v <= 56.

Version for FF v <= 56

  // For FF < v57 >...?
  async function set_addons_as_signed() {
      Components.utils.import("resource://gre/modules/addons/XPIProvider.jsm");
      Components.utils.import("resource://gre/modules/AddonManager.jsm");
      let XPIDatabase = this.XPIInternal.XPIDatabase;
      
      let addons = await XPIDatabase.getAddonList(a => true);
  
      for (let addon of addons) {
          // The add-on might have vanished, we'll catch that on the next startup
          if (!addon._sourceBundle.exists())
              continue;
  
          if( addon.signedState != AddonManager.SIGNEDSTATE_UNKNOWN )
              continue;
  
          addon.signedState = AddonManager.SIGNEDSTATE_NOT_REQUIRED;
          AddonManagerPrivate.callAddonListeners("onPropertyChanged",
                                                  addon.wrapper,
                                                  ["signedState"]);
  
          await XPIProvider.updateAddonDisabledState(addon);
  
      }
      XPIDatabase.saveChanges();
  }
  
  set_addons_as_signed();

Please let me know which versions are compatible, and where it breaks down!

Don't forget to enable devtools.chrome.enabled in about:config and use the actual browser console, not the web console