Looking at the video we can notice that source tabs keep being renamed, added, all named `source` + a number, meaning we are in eval'd code. Here we are debugging code which is evaluated in content processes thanks to SpecialPowers.spawn, which might explain why we see that. And we also know that we have slightly regressed our behavior for pausing frames with EFT (cf bug 1833637).
Bug 1837480 Comment 1 Edit History
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Looking at the video we can notice that source tabs keep being renamed, added, all named `source` + a number, meaning we are in eval'd code. Here we are debugging code which is evaluated in content processes thanks to SpecialPowers.spawn, which might explain why we see that. And we also know that we have slightly regressed our behavior for pausing frames with EFT (cf bug 1833637). Edit: would be interesting to try to set `devtools.every-frame-target.enabled` to false and see if that helps.