Bugzilla

Also: at the moment the bug happens (in both Firefox and Chrome-pretending-to-be-Firefox), a TypeError shows up in the web console:
> cause: TypeError: can't access property "Fh", this.yd().Hg() is null
​> message: "Error in protected function: can't access property \"Fh\", this.yd().Hg() is null"

Devtools says this is for the following URL & line/column (though I'm not sure this info is precisely accurate or at least useful, given that it's obfuscated/minified):
https://mail.google.com/_/scs/mail-static/_/js/k=gmail.main.…/ed=1/im=1/ct=zgms/rs=AHGWq9DrqG4CvOomzF2L-7kbYRIoUR9mIA/m=e"
​​lineNumber: 46
columnNumber: 440
​​

Also: at the moment the bug happens (in both Firefox and Chrome-pretending-to-be-Firefox), a TypeError shows up in the web console:
> cause: TypeError: can't access property "Fh", this.yd().Hg() is null
​> message: "Error in protected function: can't access property \"Fh\", this.yd().Hg() is null"

Devtools says this is for the following URL & line/column (though I'm not sure this info is precisely accurate or at least useful, given that it's obfuscated/minified):
https://mail.google.com/_/scs/mail-static/_/js/k=gmail.main.…/ed=1/im=1/ct=zgms/rs=AHGWq9DrqG4CvOomzF2L-7kbYRIoUR9mIA/m=e
​​lineNumber: 46
columnNumber: 440
​​

Also: at the moment the bug happens (in both Firefox and Chrome-pretending-to-be-Firefox), a TypeError shows up in the web console:
> cause: TypeError: can't access property "Fh", this.yd().Hg() is null
​> message: "Error in protected function: can't access property \"Fh\", this.yd().Hg() is null"

Devtools says this is for the following URL & line/column (though I'm not sure this info is precisely accurate or at least useful, given that it's obfuscated/minified):
https://mail.google.com/_/scs/mail-static/_/js/k=gmail.main.en.[...SNIP...]R9mIA/m=e
lineNumber: 46
columnNumber: 440
​​
(I've redacted part of the URL with [...SNIP...] because it's super-long and perhaps somewhat specific to my account, not sure.)