Draft: bug_34108+40266+25934+40251+40259+40272: Update components for switch to mozilla88-based Fenix (+ other changes)
Closes #25934 (closed) #40251 (closed) (reviewed in !253 (closed))
Closes #34108 (closed) #40266 (closed) (same patches as in !259 (closed))
Closes #40272 (closed).
Closes #40259 (closed).
Still a draft: #40259 (closed) is not complete.
This is replacing !257 (closed).