If, as I suspect is often going to be the case, you cannot modify the Firefox install directory because of company IT policy (likely the same policy that has you stuck on an old Firefox), I discovered (first hand) that as an alternative to the autoconfig.js approach, it also works to use the JS console.
1. set `devtools.chrome.enabled` to true in about:config
2. hit Ctrl + Shift + J to bring up the console
3. Paste this into the console and hit enter on Fx54 or earlier:
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try { Components.utils.import("resource://gre/modules/addons/XPIProvider.jsm", {}).eval("SIGNED_TYPES.clear()"); } catch(ex) {}
For Fx56 and (I hear) Fx55, you need this one instead:
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try { Components.utils.import("resource://gre/modules/addons/XPIInstall.jsm", {}).eval("SIGNED_TYPES.clear()"); } catch(ex) {}
4. Install NoScript
5. Reset `devtools.chrome.enabled` and restart Firefox.
This might even be a better way to do it because it's an ephemeral change that won't persist past the restart.
EDIT: Source for the second bit of code is
https://www.ghacks.net/2016/08/14/overr ... nt-4220684 I'll note also that there's another that claims to be better a few posts down, but I haven't figured out what it's exactly doing or tried it myself.