Bug 1057905 - [v1.4] Avoid activeApp is null when receiving STK message. r=Tim.
Merge pull request #23226 from nullaus/bug1055352

bug 1055352 - Do not process finalized state changes in the downloads li...
(cherry picked from commit 90071b13f73282c8b96990135952b4fe7eccc869)
Merge pull request #23276 from nullaus/v1.4

Merge pull request #23226 from nullaus/bug1055352
Merge pull request #23252 from weigao123/Bug1057905-v1.4

Bug 1057905 - [v1.4] Avoid activeApp is null when receiving STK message. r=Tim.