0709 = true breaks CB and as a result also FF 77

[crssi]

/* 0709 */ user_pref("network.file.disable_unc_paths", true);

Breaks CanvasBlocker and as a result all communication fails in Firefox 77.

Removing and reseting 0709 (FF restart is needed) restores all functionality.

Cheers

[collinbarrett]

Confirmed, that fixes it. Thanks!

[Thorin-Oakenpants]

Isn't this the same as #923 and you can also fix it by adding
dom.quotaManager.useDOSDevicePathSyntax=false
which E suggested adding to the user.js for 77 (it's fixed in 78)

can someone test please

[crssi]

Tested.
You and Big E are right as always, or most of the times. 😄 👍

[Thorin-Oakenpants]

OK, I already pinned the other one, so I'll close this, and on the other one cleanup the title and add something to OP

[sgabe]

I have just encountered this with Firefox 77. I can confirm that resetting 0709 fixes the issue.