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Bug
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Resolution: Not A Defect
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Minor
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None
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Firefox 120.0
The background for dropdowns is transparent for me in Firefox. It does work in Chrome, but im not sure why. There is no background style set.
- is duplicated by
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- Closed
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[JENKINS-72430] Dropdown background is transparent when the browser does not support backdrop-filter
Lukas
added a comment - https://developer.mozilla.org/en-US/docs/Web/CSS/backdrop-filter says it is not supported in my browser, I can try to find out why that is the case.
Lukas
added a comment - https://developer.mozilla.org/en-US/docs/Web/CSS/backdrop-filter says it is not supported in my browser, I can try to find out why that is the case.
Lukas
added a comment - Setting layout.css.backdrop-filter.force-enabled to true works:
Not sure why this is necessary though
Lukas
added a comment - Setting layout.css.backdrop-filter.force-enabled to true works:
Not sure why this is necessary though 
Markus Winter
added a comment - According to https://stackoverflow.com/questions/63789769/why-backdrop-filter-in-firefox-dont-work there is another property to check: gfx.webrender.all
Markus Winter
added a comment - According to https://stackoverflow.com/questions/63789769/why-backdrop-filter-in-firefox-dont-work there is another property to check: gfx.webrender.all Lukas
added a comment - Thanks for the help. How should we proceed here? Lukas
added a comment - I tried setting gfx.webrender.all to true, but that alone was not enough - I still needed layout.css.backdrop-filter.force-enabled
Lukas
added a comment - I tried setting gfx.webrender.all to true, but that alone was not enough - I still needed layout.css.backdrop-filter.force-enabled Lukas
added a comment - As I have now a working solution for this seemingly very rare problem, I will close the issue.
Lukas
added a comment - As I have now a working solution for this seemingly very rare problem, I will close the issue. lgf10 Is there something unusual about your client graphics hardware or OS?
I tried setting gfx.webrender.all to true
References I found mentioning this also mentioned the need to restart the browser for the change to be effective, did you?
Lukas
added a comment - I just did some digging in about:support and while I'm not sure if I would call it unusual, it explains everything.
I am using Remote Desktop, which results in the real GPU being replaced:
This causes Firefox to disable the backdrop-filter, since it cant parse the driver
Lukas
added a comment - I just did some digging in about:support and while I'm not sure if I would call it unusual, it explains everything.
I am using Remote Desktop, which results in the real GPU being replaced:
This causes Firefox to disable the backdrop-filter, since it cant parse the driver
Lukas
added a comment - I guess we have now reached the end of the rabbit hole. I would never have guessed that the dropdown being transparent would in any way be related to Remote Desktop - I don't think I have ever had anything remotely similar to this issue. Again, thanks for helping solve this issue 
Lukas
added a comment - I guess we have now reached the end of the rabbit hole. I would never have guessed that the dropdown being transparent would in any way be related to Remote Desktop - I don't think I have ever had anything remotely similar to this issue. Again, thanks for helping solve this issue
The backdrop-filter does not seem to be applied: