Note: I haven't gotten a chance to fully investigate or debug this, yet. But from initial tests, it appears that after switching a tab's container, Firefox crashes. Will provide further repro steps and info later once I've got a solid reproduction setup.
The only addon I have enabled is Switch Container Plus. Cleared cache, but issue persists.
[...]
GraphicsCriticalError: |[0][GFX1-]: Unknown pipeline used for iframe IframeDisplayItem { clip_id: Clip(4, PipelineId(1, 8)), pipeline_id: PipelineId(1, 26) } (t=31.7268) |[16][GFX1-]: Unknown pipeline used for iframe IframeDisplayItem { clip_id: Clip(4, PipelineId(1, 8)), pipeline_id: PipelineId(1, 32) } (t=39.6819) |[17][GFX1-]: Unknown pipeline used for iframe IframeDisplayItem { clip_id: Clip(4, PipelineId(1, 8)), pipeline_id: PipelineId(1, 32) } (t=39.6988) |[18][GFX1-]: Unknown pipeline used for iframe IframeDisplayItem { clip_id: Clip(4, PipelineId(1, 8)), pipeline_id: PipelineId(1, 32) } (t=39.8627) |[19][GFX1-]: Unknown pipeline used for iframe IframeDisplayItem { clip_id: Clip(4, PipelineId(1, 8)), pipeline_id: PipelineId(1, 32) } (t=39.8948) |[20][GFX1-]: Unknown pipeline used for iframe IframeDisplayItem { clip_id: Clip(5, PipelineId(1, 30)), pipeline_id: PipelineId(1, 29) } (t=41.0961) |[6][GFX1-]: Unknown pipeline used for iframe IframeDisplayItem { clip_id: Clip(4, PipelineId(1, 8)), pipeline_id: PipelineId(1, 26) } (t=31.842) |[7][GFX1-]: Unknown pipeline used for iframe IframeDisplayItem { clip_id: Clip(4, PipelineId(1, 8)), pipeline_id: PipelineId(1, 26) } (t=31.9577) |[8][GFX1-]: Unknown pipeline used for iframe IframeDisplayItem { clip_id: Clip(4, PipelineId(1, 8)), pipeline_id: PipelineId(1, 26) } (t=31.976) |[9][GFX1-]: Unknown pipeline used for iframe IframeDisplayItem { clip_id: Clip(4, PipelineId(1, 8)), pipeline_id: PipelineId(1, 26) } (t=32.0583) |[10][GFX1-]: Unknown pipeline used for iframe IframeDisplayItem { clip_id: Clip(4, PipelineId(1, 8)), pipeline_id: PipelineId(1, 32) } (t=39.2076) |[11][GFX1-]: Unknown pipeline used for iframe IframeDisplayItem { clip_id: Clip(4, PipelineId(1, 8)), pipeline_id: PipelineId(1, 32) } (t=39.2242) |[12][GFX1-]: Unknown pipeline used for iframe IframeDisplayItem { clip_id: Clip(4, PipelineId(1, 8)), pipeline_id: PipelineId(1, 32) } (t=39.242) |[13][GFX1-]: Unknown pipeline used for iframe IframeDisplayItem { clip_id: Clip(4, PipelineId(1, 8)), pipeline_id: PipelineId(1, 32) } (t=39.2577) |[14][GFX1-]: Unknown pipeline used for iframe IframeDisplayItem { clip_id: Clip(4, PipelineId(1, 8)), pipeline_id: PipelineId(1, 32) } (t=39.2905) |[15][GFX1-]: Unknown pipeline used for iframe IframeDisplayItem { clip_id: Clip(4, PipelineId(1, 8)), pipeline_id: PipelineId(1, 32) } (t=39.596)
InstallTime: 1526311041
MozCrashReason: Didn't find a cached resource with that ID!
Notes: AdapterVendorID: 0x1002, AdapterDeviceID: 0x67efFP(D00-L1000-W00000000-T010) WR! WR+ OMTP? OMTP+3 GL Context? GL Context+
[...]
"addons":{"activeAddons":{"{d5ac33ed-723c-402b-b17c-e7bbb0d3a80d}":{"version":"0.14","scope":1,"type":"extension","updateDay":17651,"isSystem":false,"isWebExtension":true,"multiprocessCompatible":true,"blocklisted":false,"description":"Allows to switch the current tab to a different container in multiple ways","name":"Switch Container Plus","userDisabled":false,"appDisabled":false,"foreignInstall":false,"hasBinaryComponents":false,"installDay":17651,"signedState":2}
[...]
Vendor: Mozilla
Version: 62.0a1
useragent_locale: en-US
This report also contains technical information about the state of the application when it crashed.