Bugzilla

Seems to be a regression from bug 1765615. I generated linux64 debug fuzzing builds for that commit and its parent, and grizzly confirms that `	b2727a598452fb942e0611df5f931d4df0efaceb` reproduces the issue and `5608664350d824d3974f3026972afb0b23e5ee75` does not.

Confirmed by running this for bug 1765615's parent revision:
```
cd /tmp
export REV=5608664350d824d3974f3026972afb0b23e5ee75
python3 -m fuzzfetch -d --autoland --fuzzing -n firefox-$REV  --build $REV
python3 -m grizzly.replay.bugzilla --repeat 5 ./firefox-$REV/firefox 1878188
```
(no issues detected)
and then running that same command with bug 1765615's own revision:
```
cd /tmp
export REV=b2727a598452fb942e0611df5f931d4df0efaceb
python3 -m fuzzfetch -d --autoland --fuzzing -n firefox-$REV  --build $REV
python3 -m grizzly.replay.bugzilla --repeat 5 ./firefox-$REV/firefox 1878188
```

Seems to be a regression from bug 1765615. I generated linux64 debug fuzzing builds for that commit and its parent, and grizzly confirms that `	b2727a598452fb942e0611df5f931d4df0efaceb` reproduces the issue and `5608664350d824d3974f3026972afb0b23e5ee75` does not.

Confirmed by running this for bug 1765615's parent revision:
```
cd /tmp
export REV=5608664350d824d3974f3026972afb0b23e5ee75
python3 -m fuzzfetch -d --autoland --fuzzing -n firefox-$REV  --build $REV
python3 -m grizzly.replay.bugzilla --repeat 5 ./firefox-$REV/firefox 1878188
```
(no issues detected)
and then running that same command with bug 1765615's own revision:
```
cd /tmp
export REV=b2727a598452fb942e0611df5f931d4df0efaceb
python3 -m fuzzfetch -d --autoland --fuzzing -n firefox-$REV  --build $REV
python3 -m grizzly.replay.bugzilla --repeat 5 ./firefox-$REV/firefox 1878188
```
where grizzly saw the assertion-failure happen:
`Result: Assertion failure: aFrame->GetDepthInFrameTree() == mList[mList.IndexOf(aFrame)].mDepth, at /builds/worker/checkouts/gecko/layout/base/DepthOrderedFrameList.cpp:21 (f91f2f21:d235c775)`