In addition to @Chris Cosgrove's excellent advice....
I could well be wrong and missing something, but I am not aware of Firefox 42 performing mandatory, automatic Flash Player updates?
The release notes are here, and I don't see any mention of that: Release Notes
In fact, I just manually updated Flash Player to 126.96.36.199 by following this process:
1) Download Flash Player installers for Plug-In browsers (Firefox) and Active-X browsers (IE) from here: https://www.adobe.com/products/flashplayer/distribution3.html (these are the "slim" installers, with no bundled stuff)
2) Close browsers
3) Run the Flash Player uninstaller from here: https://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html
4) Run both Flash Player installers
I have used this process for many years, with excellent results and no bundled freebies.
Perhaps you are thinking of MS Edge, which -- if I understand correctly -- *does* have embedded Flash Player and does update automatically (I cannot test that, as I run Win 7)??
If it is Firefox, could you please provide a screen shot of the Firefox options/settings where you see the mandatory Flash Player updates or a link that mentions that?
(I would like to learn.)
Edited by MoxieMomma, 10 November 2015 - 07:02 AM.