Sometimes the Browser toolbox window doesn't open. This is happening time to time for me and it's really frustrating. I have to setup a new profile to workaround the issue.

I don't have any specific STRs except that it often happens after I close my Firefox window while having the Browser Toolbox opened.

I am seeing this error in the black system console:

Debugger Server for Browser Toolbox listening on port: 55133
Starting Browser Toolbox C:\src\mozilla.org\mozilla-central\obj-x86_64-pc-mingw32\dist\bin\firefox.exe -no-remote -foreground -profile C:\Users\honza\AppData\Roaming\Mozilla\Firefox\Profiles\zv80cmcn.build-fission5\chrome_debugger_profile -chrome chrome://devtools/content/framework/browser-toolbox/window.html -purgecaches
JavaScript error: , line 0: UnknownError: The operation failed for reasons unrelated to the database itself and not covered by any other error code.
JavaScript error: , line 0: uncaught exception: Object

This part is interesting:

The operation failed for reasons unrelated to the database itself and not covered by any other error code

It corresponds to:
https://searchfox.org/mozilla-central/rev/3a0a8e2762821c6afc1d235b3eb3dde63ad3b01a/dom/base/domerr.msg#56

Do we store some info about re-opening the Browser Toolbox in the next Firefox session in IndexDB? Where is that happening? Could that be a problem?

Honza

Honza

Not sure if bug 1146414 and bug 1173608 could be related.

Honza

Brian, I recall we were talking about this while back. Do you have any tips where to look?

Note that I am on Win10

Honza

@Belén: could this be related to bug 1586741 ?

Honza

This is likely fixed by work done in Bug 1120863 - Browser toolbox starts blank and doesn't function with pending updates
Feel free to reopen if you are still experiencing this issue.

Honza