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I'm running Ubuntu 12.04 64-bit and Google Chrome version 28.0.1500.71 (the latest as of this writing).

There are a lot of themes with transparency in the Chrome Web Store, but they never work on my system. What kind of configuration am I missing to make transparent themes work in Chrome?

Here is an example of a theme that should be transparent but is not:

enter image description here

On my system (the dark gray title-bar is not transparent):

enter image description here

From my about:gpu page (before enabling flags and messing with stuff):

enter image description here

about:gpu page (after messing with stuff)

enter image description here

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Check your about:gpu page. It may be that you don't have hardware acceleration enabled, or chrome don't detects it correctly, ergo you don't get transparencies. –  Braiam Jul 28 '13 at 18:25
    
I added a screencap of that page to my post. –  Jason Jul 28 '13 at 18:35
    
Try the solutions offered here. Remember to restart the browser. –  Braiam Jul 28 '13 at 18:42
    
Hmm, I am still unable to have transparent themes on Ubuntu. I have changed the settings as you described, switched back to default Chrome theme and re-installed new transparent themes with no luck. I have also tried enabling additional relevant settings in the about:flags page. One last thing: I have installed the latest driver from NVIDIA for 64-bit Linux for my graphics card. I'm not sure what else to try. –  Jason Jul 28 '13 at 19:13
    
I found that it's because the theme depends on some gtk2 (as the theme suggest in a link in the description) functions not present in gtk3 and that's why it fails. I've tried in my Debian 7 and failed too. So, the theme(s) is too old or chrome don't support the transparency in newer systems. –  Braiam Jul 29 '13 at 14:00
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