Bug 1606108 - Autoscroll works only once in iframe r=Gijs Differential Revision: https://phabricator.services.mozilla.com/D58390

Bug 1499105 - P2 - NormalFileHandleOp::Cleanup() no longer asserts mResponseSent when called after failed initialization r=janv If NormalFileHandleOp's initialisation fails, it is not possible to send a failure response, which is why mResponseSent remains `false`. To not assert the value of mResponseSent in such cases, check for a new Boolean member mEnqueued has been introduced. If mEnqueued is `false`, that suggests initialization failure. Differential Revision: https://phabricator.services.mozilla.com/D59326

Bug 1607310 - Polish Eager Evaluation UI. r=nchevobbe Differential Revision: https://phabricator.services.mozilla.com/D58842

Bug 1608036 - fix pinned tabs getting lost when restoring sessions, r=dao a=Aryx Differential Revision: https://phabricator.services.mozilla.com/D59335

Bug 1600263 - Part 2: Add mochitests for target switching r=jdescottes Differential Revision: https://phabricator.services.mozilla.com/D57481

Bug 1600263 - Switch the Application panel to use the new TargetList API r=jdescottes Differential Revision: https://phabricator.services.mozilla.com/D57139

Bug 1608428 - rename lucetc toolchain task; r=rstewart We're going to build `lucetc` for other platforms; let's prefix this task with the platform name like we do for other toolchains. Differential Revision: https://phabricator.services.mozilla.com/D59498

Bug 1608438: part 2) Move ancient explanation about `Selection::Extend` inside that method. r=smaug Differential Revision: https://phabricator.services.mozilla.com/D59512

Bug 1608438: part 1) Rename obscure variables in `Selection::Extend`. r=smaug Differential Revision: https://phabricator.services.mozilla.com/D59511

Bug 1608386 - [ci] Run mozlint linters in parallel, r=marco If you pass in multiple paths to mozlint, it will attempt to parallelize them across processes. With this change, we pass in all top-level files and directories into mozlint rather than the topsrcdir itself. This triggers the parallelization. The 'yaml' and 'codespell' linters were excluded because they had issues. Differential Revision: https://phabricator.services.mozilla.com/D59527

Bug 1603904 - Assert WriteInfoComparator doesn't get nulls. r=janv Doesn't seem like it can. Differential Revision: https://phabricator.services.mozilla.com/D57191

Bug 1601301, modify browser_devices_get_user_media_in_frame.js to iterate twice, once performing the operation on two same-process frames, and a second time with frames that in fission mode would be in different processes, r=johannh The observer listening is also modified to listen to notifications from all frames. Differential Revision: https://phabricator.services.mozilla.com/D56571

Bug 1601301, rework webrtc permission granting UI around JSWindowActor, performing the work of determining the ultimate state for the tab icon and menu in the parent rather than the content process, r=johannh Differential Revision: https://phabricator.services.mozilla.com/D56570

Bug 1601301, add an 'include descendants' flag to mediaCaptureWindowState. With fission, need to handle each subframe separately, r=jib The window will be supplied in the recording-device-events notification and mediaCaptureWindowState will be called on each window in turn. Differential Revision: https://phabricator.services.mozilla.com/D56569

Bug 1508730 - Add `WebRequestError#certificate`. r=geckoview-reviewers,droeh,agi This is useful if you get a certificate-related error and want to inspect the broken certificate. Differential Revision: https://phabricator.services.mozilla.com/D58170

Bug 1508730 - Add `WebResponse#certificate` r=geckoview-reviewers,droeh,agi This is the server certificate, if any, as a java.security.cert.X509Certificate. Differential Revision: https://phabricator.services.mozilla.com/D58156

Bug 1508730 - Add `WebResponse#isSecure` r=geckoview-reviewers,droeh,agi Differential Revision: https://phabricator.services.mozilla.com/D58155

Bug 1508730 - Expose full X509Certificate in `SecurityInfo` object r=geckoview-reviewers,droeh,agi Differential Revision: https://phabricator.services.mozilla.com/D58154

Bug 1593555 - Floated elements can be grid items, don't show warnings about them r=miker Even if floated, an child element to a grid container can still be positioned using the grid-row/column/area placement properties. So, when that happens, don't show a warning telling users that these properties are inactive, because they are. Differential Revision: https://phabricator.services.mozilla.com/D57815

bug 1603078: taskcluster: add remote(pup-fis) job; r=ahal Because the Puppeteer unit tests run as source tasks and not test tasks, we can't rely on the generic technique for enabling Fission available to other test tasks based on mozharness. Since the puppeteer task is a simple, opt-in, non-scheduled job we duplicate it as puppeteer-fis and pass --enable-fission to "./mach puppeteer-test" instead. This achieves the same effect. Differential Revision: https://phabricator.services.mozilla.com/D58598