Found via bughunter and reproduced via latest tinderbox trunk windows debug builds on windows 7 Steps to reproduce: -> Load https://us.cricut.com/design/#/canvas/upload-image-basic-1 ---> Assertion failure after around ~ 10 seconds Assertion failure: clip (Need to be clipped wrt aASR. Do not call this function with an ASR that our child items don't have finite bounds wrt.), at c:/builds/moz2_slave/m-cen-w32-d-000000000000000000/build/src/layout/painting/nsDisplayList.cpp:1854

[Tracking Requested - why for this release]: mstange, seems this assertion was added in Bug 1298218 - could you take a look, thanks!

No reply from mstange in a month. Jet, can you find somebody to look into this assertion failure?

Sorry, I was busy with other stuff and lost track of this. I'll see if I can reproduce this. There's a bunch of other fallout from bug 1298218 that I also need to look at.

Any luck here? I'm not sure if 55 is also affected.

Mark 54 won't fix as this is late for Beta54.

Among the many regressions that are tracked for 55, this one doesn't seem so critical. Tracking "-". If there is a fix ready, and it's low risk, we can consider uplifting to Beta55.

I encountered this a few times while loading a MozReview page in a debug build and moving my mouse or clicking on the r+ drop down in the green bar that appears at the top after clicking Finish Review.

fyi, Bughunter has hit this on 176 urls in the last two months.