Tor browser is something else, I don’t group it in with stuff like Librewolf.
For librewolf, I just took a look to try and figure out what binary blobs are being talked about. This is the repository I was looking at, I think its the right place: codeberg.org/librewolf/source/src/branch/main. There isn’t much documentation on the patches besides the file names for the most part, but do you have any idea which of these relates to binary blobs? Or is it in the settings file? Really nothing I see here convinces me that this project is worth anybody’s time over regular firefox, it just changes some defaults, disables pocket (they patch it out, but there’s already a setting), and changes the branding. I don’t disagree with most of their changes, I just don’t see the point of maintaining and marketing an entire derivative browser for what could just be a settings hardening guide on a wiki somewhere.