I could reproduce the problem with local build.
Bug 1827340 Comment 9 Edit History
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I could reproduce the problem with local build like the following - [1] set pref dom.popup_maximum = 200 - [2] ./mach run testcase.html If [2] does not cause the problem. Repeat [2] until the problem happens.
I could reproduce the problem with local build like the following - [1] Update prefs + set pref dom.popup_maximum = 200 + set pref gfx.webrender.software = true - [2] ./mach run testcase.html If [2] does not cause the problem. Repeat [2] until the problem happens.