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Change Right-Click Copy-Image File Format from TIFF to JPG

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This problem might be unique to Mac OS, and may not even be a Firefox issue at all, but I had to try and see if there was an answer in here somewhere. I frequently use the "copy-image" command from the right-click contextual menu from within Firefox. When I paste that image into a text message for example, it's converted to a TIFF, regardless of the actual format it's in on the website I found it. Unfortunately, Android phones won't accept a text with a TIFF image, causing a delivery failure. There's more reasons why this is annoying, but that's the main one. Is there any way to make sure that copy command retains the original format of the image when copied to the clipboard? Thanks.

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Looks like a Mac issue because Firefox doesn't know about TIFF as well.

Recently there was another thread about this issue (also OS X 10.16).

Just to be sure:

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or userChrome.css is causing the problem.

  • switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes
  • do NOT click the "Refresh Firefox" button on the Safe Mode start window


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