@vtpup :-
Sorry to be a while getting back to you, Steve; didn't see this until today....
TBH, since you're only thinking of Firefox as a "means to an end", why don't you just download LibreOffice-portable direct? I've had a copy of it up at MediaFire since January (I seem to recall somebody else wanted it, and was having "issues" with MediFire, too), so you can snag it from here:-
https://www.mediafire.com/folder/un7het ... ibreOffice
I've checked, and Seamonkey can download this with no complaints from MediaFire. Do be aware that this is NOT the latest all-singing, all-dancing build; it IS a 7-series, albeit a very early 7-series - 7.0.3.1, to be exact. It is, however, rock-solid, and will do everything you want from it.......it's one of the very last builds from before the LO team decided their office suite would henceforth use Java for the database stuff (God knows why!) I've been using this for quite some time; it's never given me any problems.
Let me know if that link works for you. It should. Having shelled out for a basic Google Drive subscription - £1.60 a month for 100GB extra - I shall slowly be migrating everything back there over time.....but I'll be keeping the MediaFire a/c for awkward cases like this, since I've yet to find a browser it won't "play nice" with!
EDIT:- Never noticed it before; in SeaMonkey, the Drive is completely unresponsive, isn't it? Huh... Not everybody has as many browsers to play with as I do, I know, but I believe most folks have at least one or two alternatives. I know every browser should be able to do exactly the same things, but remember; some developers make the conscious choice NOT to support certain parts of the 'standard' web protocols. That's their decision, and we have to respect that, of course...
(*shrug...*)
Mike.