Luis Leiva

Maybe related: With the latest `texlive-full` installation (2019.20200218-1) and `fonts-linuxlibertine` (5.3.0-4) I can't see the summation symbol (`+`) in the generated PDF (using pdflatex for compilation). I see the following...

You can give it a try in Firefox. Please see the updated README.

The Firefox version is unsupported, though you can package the extension as a ZIP file. See https://extensionworkshop.com/documentation/publish/package-your-extension/

No idea. As I said, the Firefox version is unsupported, sorry.