1311850 - unable to drag via top of window on OS X (also discoloration)

Status: RESOLVED INCOMPLETE

(Firefox :: General, defect)

Description

[Josh Aas]

Attachment: Discoloration (see it cut across the top of tabs and above tabs)

Recently I started noticing that I can't drag Firefox browser windows around by the top of the window. If I drag from near the bottom of a tab it will work, but higher up I cannot drag. I looked closer and there is actually some discoloration of the area where I cannot drag.

This is a pretty frustrating bug because dragging windows around is a common operation.

I'm on OS X 10.11.6. Bug persists with no extensions enabled. Is always reproducible, survives quitting and restarting Firefox.

Comment 1

[Josh Aas]

This bug exists in Firefox 49.0 and 49.0.2.

Comment 2

[Josh Aas]

The bug also exists at least as far back as Firefox 46.0.1.

Comment 3

[:Gijs (he/him)]

Does it work on a clean profile? If so, do you have a userContent/userChrome css file or perhaps prefs set that might be affecting this?

(I just checked, and it seems to work fine here, also on 10.11.6)

Comment 4

[Markus Stange [:mstange]]

This is extremely strange. I have no explanation.

Comment 5

[Josh Aas]

Happens with a clean/new profile. I'm on a 15-inch Retina MBP. I have no unusual apps running or any modifications to my system.

Comment 6

[Josh Aas]

Here's an exciting development - I have the exact same window dragging bug, with the exact same associated discoloration, in Chrome 54.

Comment 7

[:Gijs (he/him)]

(In reply to Josh Aas from comment #6)
> Here's an exciting development - I have the exact same window dragging bug,
> with the exact same associated discoloration, in Chrome 54.

Uhhh. OK. Any OSX-wide apps that might mess with this? Does the same thing happen on a separate OS X profile? (not sure how isolated those would be... you'd know better than me!)

Comment 8

[Josh Aas]

I had/have no systemwide apps installed.

Upgrading to macOS Sierra resolved the issue for both Firefox and Chrome.

Comment 9

[:Gijs (he/him)]

OK, sounds like for now we won't have enough info to take further action for this bug, so resolving as incomplete.