How do i enable dark mode in PDF?

[bdmariobd]

I'm using firefox extension.

[Gusted]

It's not possible to enable the dark mode on PDF's within Firefox. It's a security restriction from Firefox.

[bdmariobd]

Oh, didn't know.
Now I see that in the older verison of DarkReader it's more clear that issue:

It means: this page is protected by the navigator.
While in new version, it only says:

I feel that it was more clear in older version. Maybe is this an issue?

[Gusted]

I feel that it was more clear in older version. Maybe is this an issue?

Definitely, @alexanderby We should have that protected by browser UI Element back in the new design.

[alexanderby]

Oh, I missed it

[luo-chuan]

If you use Firefox, you can edit userContent.css like this:

@media (prefers-color-scheme: dark){
  .pdfViewer{filter: invert(1) hue-rotate(180deg);}
}

If you use Chrome or Edge, install the extention "PDF Reader", then edit the extention option like this:

html[data-theme*="dark"] .pdfViewer{
  filter: invert(1) hue-rotate(180deg);
}