Can you add highlighter of the text into Firefox PDF reader. For me this is more important than adding text and drawing in it.
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There is also some similar mentions in the following thread: Improve PDF editing functionality
This was shared with the product team, and we're happy to report that it's on our backlog. We're currently collecting and evaluating feedback about the recent editing features in 106, then we'll follow up with more details on next steps/timeline/etc.