Does what said. Straight Forward. No clutter. Hope he makes more such wonderful tools. Thank you very much for this gift.

Nice and simple!

Solid and privacy-conscious! I just tried this for merging two PDFs together and it worked without issue. Many other extensions aggressively ask for access-permissions in Firefox, e.g. "read and manipulate your download history." This extension doesn't require that, because the author clearly knows that's not needed <3