Do you have the latest extension version installed?
@zoran Latest update for Firefox was March 2023. No new updates are available.
edit: It could be this kind of subtitle, which trips it up?
The version is 2.3.1
Auto-generated subtitles are not supported by the LingQ Importer.
@tiago-ribeiro For me ‘auto-generated Italian’ works fine to import. But honestly, the ‘Google Translated English >> Italian’ is more accurate.
In some cases auto-generated subtitles won’t work due to changes made by YouTube recently…