Draft a low level API hooks to allow more customisations.
Add missing tests.
Merge pull request #1571 from Gozala/bug/low-level-devpanel

Draft a low level API hooks to allow more customisations. r=@jsantell
bug 1003253 - better logging after test timeout
Bug 1073275: Use Uint8Array.prototype.set instead of Uint8Array.set for buffer.copy and buffer.write.
Merge pull request #1652 from Mossop/bug1073275

Bug 1073275: Use Uint8Array.prototype.set instead of Uint8Array.set for buffer.copy and buffer.write. r=erikvold
Merge pull request #1649 from zombie/1003253-timeout-after

bug 1003253 - better logging after test timeout, r=@Mossop
Revert "Merge pull request #1649 from zombie/1003253-timeout-after"

This reverts commit 7432dcc7084fd88446a1934d88b8aeb3decdbee9, reversing
changes made to 85b79d566213da51ee6d6e1be962776c799ea7e3.
Revert bug 893276 for causing bug 1058840.
Update test manifests.
bug 1064252 - flag Loader Sandboxes with addonId metadata
Merge pull request #1653 from zombie/1064252-loader-addonid

bug 1064252 - flag Loader Sandboxes with addonId metadata, r=Gabor
bug 1071048 - update sdk/tabs metadata to work in SeaMonkey
Merge pull request #1656 from zombie/1071048-SeaMonkey-engines

bug 1071048 - update sdk/tabs metadata to work in SeaMonkey, r=@zombie