Why not just let Firefox open the PDF? It will read them on its own. Is it missing a feature you need?
this post was submitted on 09 Jan 2026
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I need a more powerful PDF viewer with easier jumping to sections, comments, and highlighting.
How about Sumatra PDF?
ETA: I think it's open source.
Came here to suggest SumatraPDF as well
How to open it's UI in browser ?
Why do you need it to be a browser plugin, a program that embeds itself into the webbrowser?
Firefox does have PDF view and edit with section jumping, comments, and highlighting. What do you mean by “easier”? What's easier than a sidebar table of contents, and a toolbar with highlighting and comment actions? I don't see what could be “easier” than that.
it is a native app. https://github.com/sumatrapdfreader/sumatrapdf
It is the most performant pdf viewer on windows (that i know of). it uses libmupdf
Sorry I missed that part. I don't know if it has that functionality.
https://programming.dev/post/39695120
Some person on the fediverse has made an open source PDF editor... their other posts say its browser based. I haven't tried it but this seems to fit your request.
Do you need the pdf to open in Firefox/browser?
If not, PDF-XChange Editor is a pretty good advanced standalone program. It comes in free and paid versions