Especially for consumer PCs, there doesn't need to be anything to keep up with.
>> let's say you want to load it up, [snip] but without contaminating your normal environment.
Add-ons don't necessarily survive every upgrade, and take some time to catch up with the new release. Many people that I know, (in the family and outside) would rather wait on a new release than have one of their add-on break on them.
So, whatever way you put it, I am firm in my statement, that an offline installer should be a de-facto proviso, rather than being buried somewhere else.
That said, they do make the full installers easily available (google “Firefox offline installer”) should you need to update a ton of computers behind a slow connection.
For sure, lycos/ddg/ask-jeeves/bing "Firefox offline installer" is an option that is not lost on us luddites :).
But did you also notice the parent comment: "Googling for things like "firefox standalone redistributable offline install" are a road to nowhere"? ;)
They could make it more obvious but, really, the audience for that page doesn't really include people who are familiar with technical issues and have made the calculation that it would be faster to download the full thing & copy it around.
> But did you also notice the parent comment: "Googling for things like "firefox standalone redistributable offline install" are a road to nowhere"? ;)
I did – and part of the point is that that's an unnecessarily complex query. Removing any of the redundant words (e.g. "firefox standalone installer", "firefox offline install") produces the correct result as the first hit. ("redistributable" appears to be the problem as that term hits a bunch of spam download sites)
In other words, that search query was itself an attempt to micro-optimize something which turned out to be unnecessary – rather like the entire post.
Also, here's a genuine usecase for a truly offline installer... What if you are the "resident software/pc maintainer" of your extended family.... In such a case, would it not make better sense to have one complete download, then copy it into a pen drive, and install it on every machine, without spending 30 mins to an hour on every machine, doing a download+install for every single one!
The rationale of an online installer might be justified as some of the replies indeed seem to do, but, I think that there is something fundamentally flawed/wrong with having to first "download an installer", only to have it "download the application" again! I mean, what the hell!?
EDIT: Also, the speed of these release cycles (not just Mozilla, but other software too!) are getting old and tired to keep up with, TBH...