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Why is there a thin, White line at the top of my firefox window?

Posted

There's been a thin, white line at the top of any running instance of firefox, on both my MBP and imac, both running 10.12.4. Currently running firefox 53, but it was there on 52 as well. Appears on all of my themes, but screenshots were taken with the compact dark theme for emphasis.

There's been a thin, white line at the top of any running instance of firefox, on both my MBP and imac, both running 10.12.4. Currently running firefox 53, but it was there on 52 as well. Appears on all of my themes, but screenshots were taken with the compact dark theme for emphasis.

Additional System Details

Application

  • Firefox 53.0
  • User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:53.0) Gecko/20100101 Firefox/53.0
  • Support URL: https://support.mozilla.org/1/firefox/53.0/Darwin/en-US/

Extensions

  • Adblock Plus 2.8.2 ({d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d})
  • Application Update Service Helper 2.0 (aushelper@mozilla.org)
  • Disconnect 5.18.21 (2.0@disconnect.me)
  • HTTPS Everywhere 5.2.15 (https-everywhere@eff.org)
  • Multi-process staged rollout 1.14 (e10srollout@mozilla.org)
  • Pocket 1.0.5 (firefox@getpocket.com)
  • Web Compat 1.0 (webcompat@mozilla.org)

Javascript

  • incrementalGCEnabled: True

Graphics

  • adapterDescription:
  • adapterDeviceID: 0x0166
  • adapterDrivers:
  • adapterRAM:
  • adapterVendorID: 0x8086
  • crashGuards: []
  • currentAudioBackend: audiounit
  • driverDate:
  • driverVersion:
  • featureLog: {u'fallbacks': [], u'features': [{u'status': u'available', u'description': u'Compositing', u'log': [{u'status': u'available', u'type': u'default'}], u'name': u'HW_COMPOSITING'}, {u'status': u'available', u'description': u'OpenGL Compositing', u'log': [{u'status': u'available', u'type': u'default'}], u'name': u'OPENGL_COMPOSITING'}]}
  • info: {u'TileHeight': 512, u'TileWidth': 512, u'AzureFallbackCanvasBackend': u'none', u'ApzWheelInput': 1, u'AzureCanvasAccelerated': 1, u'AzureCanvasBackend': u'skia', u'AzureContentBackend': u'skia'}
  • numAcceleratedWindows: 1
  • numTotalWindows: 1
  • webgl2Renderer: Intel Inc. -- Intel HD Graphics 4000 OpenGL Engine
  • webglRenderer: Intel Inc. -- Intel HD Graphics 4000 OpenGL Engine
  • windowLayerManagerRemote: True
  • windowLayerManagerType: OpenGL

Modified Preferences

Misc

  • User JS: No
  • Accessibility: No

Question owner

screenshot

screenshot
FredMcD
  • Top 10 Contributor
4261 solutions 59654 answers

Start Firefox in Safe Mode by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

Start Firefox in Safe Mode by holding down the <Shift> (Mac=Options) key, and then starting Firefox. A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

Question owner

Yep. Problem persists in safe mode.

Yep. Problem persists in safe mode.

Question owner

It's a little hard to see here, but the same 1-2px high white line is there, even in safe mode.

It's a little hard to see here, but the same 1-2px high white line is there, even in safe mode.
FredMcD
  • Top 10 Contributor
4261 solutions 59654 answers
https://support.mozilla.org/en-US/kb/upgrade-graphics-drivers-use-hardware-acceleration

Question owner

Tried disabling hardware acceleration : Problem persists. Tried disabling WebGL: Problem persists. Tried disabling both hardware acceleration and webGL: problem persists.

I'm up to date on my macOS updates (10.12.4), and I don't have a dedicated GPU (mbp used intel HD4000 graphics, iMac uses intel Iris Pro)

Firefox version is now 53.0 (white line still there, the problem has been there since 52.0)

Tried disabling hardware acceleration : Problem persists. Tried disabling WebGL: Problem persists. Tried disabling both hardware acceleration and webGL: problem persists. I'm up to date on my macOS updates (10.12.4), and I don't have a dedicated GPU (mbp used intel HD4000 graphics, iMac uses intel Iris Pro) Firefox version is now 53.0 (white line still there, the problem has been there since 52.0)
FredMcD
  • Top 10 Contributor
4261 solutions 59654 answers

Sporkife01 said

Currently running firefox 53, but it was there on 52 as well.

You are using the beta version. did you have the problem with beta 52, or normal 52?

''Sporkife01 [[#question-1157044|said]]'' <blockquote> Currently running firefox 53, but it was there on 52 as well. </blockquote> You are using the beta version. did you have the problem with beta 52, or normal 52?

Question owner

FredMcD said

Sporkife01 said
Currently running firefox 53, but it was there on 52 as well.

You are using the beta version. did you have the problem with beta 52, or normal 52?

As far as I know, I'm running the regular release of Firefox. I've not actually used the beta at all.

''FredMcD [[#answer-960997|said]]'' <blockquote> ''Sporkife01 [[#question-1157044|said]]'' <blockquote> Currently running firefox 53, but it was there on 52 as well. </blockquote> You are using the beta version. did you have the problem with beta 52, or normal 52? </blockquote> As far as I know, I'm running the regular release of Firefox. I've not actually used the beta at all.

Question owner

and it's the 64bit edition, if that helps.

and it's the 64bit edition, if that helps.
cor-el
  • Top 10 Contributor
  • Moderator
17540 solutions 158604 answers

I assume that is how it works on Mac and shows you a window border.

Do you still see this line in full screen mode (Command+Shift+F)?

I assume that is how it works on Mac and shows you a window border. Do you still see this line in full screen mode (Command+Shift+F)?

Question owner

I don't see thew line in fullscreen until I quit firefox, then I see it as the window closes just before the process terminates (i.e. I see the white line for a second before the application closes).

I'd be willing to assume it was a window border if it showed anywhere else with any other application, but it's literally ONLY firefox that's producing this behaviour, so I have to assume it's a FF related thing.

I don't see thew line in fullscreen until I quit firefox, then I see it as the window closes just before the process terminates (i.e. I see the white line for a second before the application closes). I'd be willing to assume it was a window border if it showed anywhere else with any other application, but it's literally ONLY firefox that's producing this behaviour, so I have to assume it's a FF related thing.
cor-el
  • Top 10 Contributor
  • Moderator
17540 solutions 158604 answers

If it is a specific Firefox thing then it should be in the CSS code. You can have a look at the main browser code to see if you can spot it. https://dxr.mozilla.org/mozilla-release/source/browser/themes/osx/browser.css

See also the DOM Inspector extension.

If it is a specific Firefox thing then it should be in the CSS code. You can have a look at the main browser code to see if you can spot it. https://dxr.mozilla.org/mozilla-release/source/browser/themes/osx/browser.css See also the DOM Inspector extension. *DOM Inspector: https://addons.mozilla.org/firefox/addon/dom-inspector-6622/ *https://developer.mozilla.org/DOM_Inspector *https://developer.mozilla.org/Introduction_to_DOM_Inspector