User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0 Build ID: 20141011015303 Steps to reproduce: After updating to version 33 there's severe lag in UI responsiveness. More notably when selecting text (in page or a url in the address bar) in can take 3-4 seconds until the text appears selected. Also, clicking in dropdown menus is not accurate. At first I though it might have something to do with hardware acceleration, but disabling it didn't solve it. Then I read the issue with the black screen and OMTC. Disabling OMTC (layers.offmainthreadcomposition.enabled;false) fixes this problem. My graphics drivers are outdated but it's a laptop and the manufacturer won't provide with newer ones. ATI Mobility Radeon HD 5165 Adapter Drivers atiumd64 atidxx64 atiumdag atidxx32 atiumdva atiumd6a atitmm64 Adapter RAM 1024 ClearType Parameters Gamma: 2200 Pixel Structure: R ClearType Level: 100 Enhanced Contrast: 50 Device ID 0x9480 Direct2D Enabled true DirectWrite Enabled true (6.2.9200.16492) Driver Date 9-8-2009 Driver Version 8.653.0.0 GPU #2 Active false GPU Accelerated Windows 1/1 Direct3D 10 Vendor ID 0x1002 WebGL Renderer Google Inc. -- ANGLE (ATI Mobility Radeon HD 5165 Direct3D9Ex vs_3_0 ps_3_0) windowLayerManagerRemote false AzureCanvasBackend direct2d AzureContentBackend direct2d AzureFallbackCanvasBackend cairo AzureSkiaAccelerated 0

I guess it's the only workaround for you, disabling OMTC in about:config (as you did) due to your outdated card. Maybe Mozilla should add this driver version to the blacklist.

>Maybe Mozilla should add this driver version to the blacklist. That's why I posted this. I was thinking of posting it as a comment on the other bug with the black screen.

(In reply to coinman from comment #0) Could you try to disable D3D11 compositing and Direct2D rendering, while still using D3D9 for compositing? To do this, go to about:config, set - layers.prefer-d3d9 to true - gfx.direct2d.disabled to true and restart the browser. If one of the prefs is missing from the about:config page, you can add it with right click > new > boolean. This will tell us whether we need to blacklist the driver entirely or if we can still do accelerated compositing through D3D9.

OK, so I re-enabled OMTC and did as you said > - layers.prefer-d3d9 to true > - gfx.direct2d.disabled to true and it works fine now.

Scratch my previous comment. I noticed a glitch. http://i.imgur.com/EpAkrTD.jpg

Is there a more up to date driver?

(In reply to Milan Sreckovic [:milan] (PTO 10/16-10/17) from comment #6) > Is there a more up to date driver? AMD has some updated drivers, but they can't be installed on Toshiba laptops last time I checked (iirc there's some workaround to do it manually, but it's not supported) and Toshiba hasn't updated theirs.

(In reply to coinman from comment #7) > (In reply to Milan Sreckovic [:milan] (PTO 10/16-10/17) from comment #6) > > Is there a more up to date driver? > > AMD has some updated drivers, but they can't be installed on Toshiba laptops > last time I checked (iirc there's some workaround to do it manually, but > it's not supported) and Toshiba hasn't updated theirs. A quick forum search yielded this info: http://goo.gl/BD21ni Apparently those driver will work on *any* laptop with kludged drivers such as the Toshiba. Can you give them a try? They're 2011 but at least that's newer than 2009. The instructions are pretty detailed and the forum from which I obtained this info said to be exacting in following the instructions. I'd also suggest having the installer for the drivers you currently have.

(In reply to Arthur K. from comment #8) > (In reply to coinman from comment #7) > > (In reply to Milan Sreckovic [:milan] (PTO 10/16-10/17) from comment #6) > > > Is there a more up to date driver? > > > > AMD has some updated drivers, but they can't be installed on Toshiba laptops > > last time I checked (iirc there's some workaround to do it manually, but > > it's not supported) and Toshiba hasn't updated theirs. > > A quick forum search yielded this info: http://goo.gl/BD21ni > > Apparently those driver will work on *any* laptop with kludged drivers such > as the Toshiba. Can you give them a try? They're 2011 but at least that's > newer than 2009. The instructions are pretty detailed and the forum from > which I obtained this info said to be exacting in following the > instructions. I'd also suggest having the installer for the drivers you > currently have. Apparently the link to the updated Catalyst drivers was broken. Users in that forum reported success with 13-1-legacy_vista_win7_win8_64_dd_ccc.exe on kludged Toshiba laptops. Updated link to those drivers here: http://goo.gl/gFkhPO