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I know how to use about:config to block showing images in Firefox; but, for some websites, I need images to be shown; what Firefox extension will allow me to make these exceptions?

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I recommend you to use uBlock Origin (Firefox Add-on). You can reenable images in the Firefox config again, if you choose this solution.

After you installed it, go to settings: enter image description here

Then enable "I'm an advanced user": enter image description here

The menu of uBlock Origin is now "advanced" (it's too in the previous screenshots): enter image description here

Column 1 is for global rules, column 2 for local (domain specific) ones. Forbid loading of images globally (yellow circle). Then you can reenable the loading of images per domain in the column 2.

Optionally save (lock icon) and refresh the page. If you don't save the changes, they will only be applied in the current session:
enter image description here

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  • Can I do this using firefox itself (without using add-on)? I mean, disabling images using about:config globally, then enabling them per case. – Alish Oct 27 '20 at 16:41
  • I don't know a way. However since I recommend everyone to use uBlock Origin anyway, it's not a big issue in my eyes. Is there a specific reason, you want to disable images in the config? – Emaro Oct 28 '20 at 7:01
  • Actually no, there is no specific reason except that some extensions threaten privacy, therefore I was preferring not to use them as much as possible. Anyway, I installed ublock origin and it is fine. – Alish Nov 1 '20 at 12:04
  • Fair point. However I'm convinced that if there would be one single add-on which actually improves privacy, it's uBlock Origin. – Emaro Nov 3 '20 at 10:09

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