Add a user-configurable default zoom level for all PDF files.

[Thibaulltt]

I use the PDF.js viewer for previewing all kinds of PDFs in Firefox: research papers, technical presentations, administrative paperwork, etc. However, I find myself nearly always reaching for the zoom level and setting it to 'Page Width' because I use a small browser window in a huge screen.

Would it be a good fit for the viewer to have a simple user-default option for the zoom level to apply ? If defined by the user, the viewer displays the PDF file using that level. Otherwise the regular logic for the default zoom level applies.

Edit: I know the user can provide options to the PDF viewer using URL GET parameters, but I'm not aware of any way to automatically add those parameters to all URLs that would be handled using the PDF viewer in Firefox.