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[Firefox] 1.3.0 breaks many sites / video players

Tested with a Clean profile on FF 68.01 with only User-Agent Switcher installed

Steps to reproduce:

  • Install User-Agent Switcher on a clean FF profile
  • Set a useragent string (global or per domain), in my case I set it to FF 67 just because its one of the defaults
  • Navigate to a youtube video
  • be greeted in the console with this error msg, nothing solves it, only downgrading to the previous addon release on AMO and disabling auto updates.
17:40:56.800 TypeError: 'plugins' called on an object that does not implement interface Navigator. df57911b-72db-4fd0-856a-ba82c0987b11:56:20
    get self-hosted:4489
    get blob:moz-extension://ce25b0e5-08c5-47ee-991d-5470efb84b3b/df57911b-72db-4fd0-856a-ba82c0987b11:56
    <anonymous> https://www.youtube.com/yts/jsbin/player_ias-vflFxFa3y/en_US/base.js:4460
    <anonymous> https://www.youtube.com/yts/jsbin/player_ias-vflFxFa3y/en_US/base.js:4461
    <anonymous> https://www.youtube.com/yts/jsbin/player_ias-vflFxFa3y/en_US/base.js:6766

I spent a good 20 minutes or so verifying that it wasn't my user.js or anything else interfering with the addon or causing breakage, as stated above I eventually made a clean profile and can reproduce the issue 100% of the time.