Merge pull request #20517 from 6a68/bug-1017224-verification-problems

Bug 1017224: Handle firefox accounts verified signal properly
Merge pull request #20983 from KevinGrandon/bug_1030200_collection_error_localization

Bug 1030200 - [vertical] Smart Collection name is not localized in offline-webresults error message
Merge pull request #20995 from sfoster/bug-1023179-tutorial-tests

Bug 1023179  - Fix FTU video unloading/loading, r=fcampo
Merge pull request #20860 from rsajdok/bug#1026932

Bug 1026932: Edit button does not gray out when the folder is empty r=jrburke