Added extensions not loading (e.g BetterTTV, 7TV)

OS: Arch Linux

BetterTTV Version: 7.6.15

Installed through the twitch AUR package

I tried to add an unpacked extension (tried both 7TV and BetterTTV) to ~/.config/Twitch/Extensions (by the way, the "Extensions" directory didn't exist, so I had to create it), but neither of them loaded when opening the app. I copied the extension folders directly from chrome:

.config/Twitch/Extensions 
❯ ls
ajopnjidmegmdimjlfnijceegpefgped  BetterTTV

.config/Twitch/Extensions 
❯ ls ajopnjidmegmdimjlfnijceegpefgped/7.6.15_0 
_locales   background.js  betterttv.js                  icon.png       permissions_upgrade.html
_metadata  betterttv.css  firefox_runtime_messaging.js  manifest.json  permissions_upgrade.js

.config/Twitch/Extensions 
❯ ls BetterTTV 
_locales   background.js  betterttv.js                  icon.png       permissions_upgrade.html
_metadata  betterttv.css  firefox_runtime_messaging.js  manifest.json  permissions_upgrade.js