@lijou
Sounds like you’re having a difficult time!
Most addons are included with the Master LingQ manifest (Including Youtube Tools), i’ve noted all the separate installs in the Readme.
The errors you noted for host_permissions is just a warning and not really an error.
If you have loaded the addon, just open up Youtube/LingQ
If still having trouble, check out the first few seconds of the Firefox video at the top or see this link by JPP
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