main/mobile-config-firefox: upgrade to 4.3.2

mobile-config-firefox@4.3.1...4.3.2

A few fixes by @1peter10, thanks!

Release 4.3.2

Fixes:
* policies.json: No longer hard-remove Google (MR 49)
* tabmenu.css: Fix private browsing mode (MR 51)
* appMenu.css: Adjust appMenu.css for Firefox 127 (MR 50)

Other:
* README: link to user0's Mobile-Friendly-Firefox