Merge pull request #16938 from crdlc/bug-978011

Bug 978011 - Unload properly Image Loader when syncing/importing
Merge pull request #16982 from steveck-chung/bug-973007

Bug 973007 - [B2G] [Messaging] Keyboard appears when accessing the contact list from the compose message screen. r=julienw
Merge branch 'v1.3' into v1.3t
Merge pull request #16324 from vingtetun/bug969544

Bug 969544 - Toggling the highlighted class of a keyboard key create ref...(cherry picked from commit 6e9b110a7a0c8d99bcfd5ab05b83da6dc44a292a)
Revert "Merge pull request #15774 from wanderview/opus-json"

This reverts commit 07343183ae1528af1ad1633f49d91f09d4107b35.