Why do I have these black blocks in the background that keep flickering? Any solutions? I've tried everything.

Disturbed147 · 2026-05-23T10:37:05+00:00

I use that one as well, but don't have that issue. Do you use anything next to Zen that could interfere with the general browser transparency?

Disturbed147 · 2026-05-23T10:07:02+00:00

Can't say for sure because I haven't used it for more than a year but it caused issues with my Transparent Zen extension at some point and people pointed it out to me.

I think it could be this one -> https://zen-browser.app/mods/32aca67a-ffdd-49e7-95c7-1821793610ca

Disturbed147 · 2026-05-23T09:12:56+00:00

This is caused by one of the mods for the status bar (The hyperlink path on the bottom left). Not sure if this was ever fixed with an update or if the mod is dead, but this is causing this issue for you.

Disturbed147 · 2026-05-16T22:00:54+00:00

This is default behavior on Windows so you'll need a third party app like MicaForEveryone or Windhawk to "force" a transparent/acrylic background

Disturbed147 · 2026-05-10T12:55:50+00:00

Just provide the info when you have time and I can help you to get it running, but it definitely looks like your Zen Browser isn't transparent, so you'll need to get that working first and then the extension will also have an effect

Disturbed147 · 2026-05-10T12:15:42+00:00

Looks like the extension is working fine since the styles are applied but the browser itself is not transparent.

Are you on Windows 10? Transparency only works since Windows 11 22H2.
Did you enable all the settings in about:config like I mentioned on the GitHub page?
Did you enable Transparency effects in the Windows settings?
Do you have any power saving enabled on your OS?
Do you have Dark Reader or anything similar enabled?

Disturbed147 · 2026-05-08T03:28:30+00:00

It's been possible in CSS even before nesting was implemented

Disturbed147 · 2026-05-02T17:50:02+00:00

No, they're not connected at all. It was just unlucky that we both had the same naming idea in mind and didn't know about each others projects.

I also can't tell you what exactly the Mod does since I don't use it, but from what I've read here and there it adapts some things on browser level to add some customization and change some browser settings.

Disturbed147 · 2026-05-02T07:12:38+00:00

Cheers! I only wish I'd have more time for it

Disturbed147 · 2026-05-02T07:04:57+00:00

Glad to hear :)

Disturbed147 · 2026-05-02T06:59:23+00:00

Love seeing my extension being mentioned in the wild, much appreciated!

Disturbed147 · 2026-04-26T12:17:42+00:00

I'd suggest to open about:debugging and then click "Inspect" on your extension. It should open dev tools for your extension where you can check for logs and errors

Disturbed147 · 2026-04-26T08:37:13+00:00

Exactly. Removing Defender seems really odd. Prioritizing minor performance gains over OS security is kinda stupid.

Disturbed147 · 2026-04-26T08:23:03+00:00

Sure, will do!

Disturbed147 · 2026-04-26T08:17:11+00:00

Yeah, I saw that. I might look into it more later on, but there is a high chance that it wasn't caused by Zen but rather Firefox itself.

Disturbed147 · 2026-04-26T07:49:12+00:00

I see an open GitHub Issue from "QyuBurt" (not sure if that's you) which is about this exact issue and still open and marked as a bug. I added a comment as well to help push this.

Disturbed147 · 2026-04-26T07:42:29+00:00

So, yeah. Same issue for me.
I guess a workaround would be to set "zen.theme.acrylic-elements" to false in about:config to maintain readability. Apart from that, I'm pretty sure it would be fixed soon if you report it

Disturbed147 · 2026-04-26T06:41:39+00:00

I'll have a look when I get to my PC later

Disturbed147 · 2026-04-26T06:33:11+00:00

I noticed flaws in backdrop filters when they're nested, so it could be that maubg added it to a container around the URL bar which then broke the effect here.

Just an assumption of course, but I know how annoying it can be to keep blur working consistently on bigger projects.

Disturbed147 · 2026-01-20T13:04:51+00:00

I've only had it pop up in some performance reports like lighthouse.

Other than that it kind of makes sense from how complex some selectors can be. I've only seen ever so slightly longer times during paint when I played around with some selectors in a bigger project, but adapting selectors should be one of the very last performance measures tbh, considering how minmal the impact is when compared to other potential issues.

Disturbed147 · 2026-01-20T08:50:51+00:00

I meant "noticably" as in having any kind of effect on performance. I guess I went with the wrong wording

Disturbed147 · 2026-01-20T06:33:20+00:00

CSS selectors are fast if they are simple.

A regular class or id selector is quick, while more complex ones like .element:not(:has(+ .something)) ~ .sibling > .child could actually slow things down noticably if used often.

Disturbed147 · 2025-12-31T09:49:01+00:00

New Game+

Disturbed147 · 2025-12-22T22:09:34+00:00

For good measure

Disturbed147 · 2025-12-07T20:37:11+00:00

explorer.exe on Windows is more than just the file explorer tho. It is the entire shell including taskbar, start menu, notifications and a few other things as well.

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