Strange problem with images
First symptom: Lately, when I use Firefox on my desktop to attach a JPG or PNG screenshot to an online post, it shows up only as a black square. (The image looks normal while I'm creating the post, but it won't post - which I've confirmed by checking my feed on a different device.) This doesn't happen when I use the same version of Firefox (the latest one), also running Windows 10, on my laptop. It has nothing to do with the screenshot itself - the specific file or the file type; the same thing happens with anything I try to attach.
Second symptom: When I create a PDF with Firefox and then try to print it, a large rectangular portion at the top is blanked out, as if someone had placed a sheet of paper on top of it. This doesn't happen when I use Chrome to open and print the same document on the same computer.
My guess is that I've somehow changed one of the graphics or image settings in about:config, but I have no idea which one.
Any ideas would be greatly appreciated.
All Replies (4)
Do you use the hidden "privacy.resistFingerprinting" preference? That changes how sites interact with canvases, which can affect various image manipulation features.
Thanks for the quick response. "privacy.resistFingerprinting" is currently set to "false," although there are a dozen other items that also begin with that and have various settings.
Thank you for checking that. Could you test in Firefox's Troubleshoot Mode? In that mode, Firefox temporarily deactivates extensions, hardware acceleration, any userChrome.css/userContent.css files, and some other advanced features to help you assess whether these are causing the problem.
If Firefox is running:
You can restart Firefox in Troubleshoot Mode using either:
- "3-bar" menu button > Help > Troubleshoot Mode...
- (menu bar) Help menu > Troubleshoot Mode...
and OK the restart. A small dialog should appear. Click the Open button.
If Firefox is not running:
Hold down the Shift key when starting Firefox. (On Mac, hold down the option/alt key instead of the Shift key.) A small dialog should appear. Click the Open button.
Note: Don't use the Refresh without first reviewing this article to understand what will be deleted: Refresh Firefox - reset add-ons and settings.
Any improvement?
I'd rather not restart right now and lose various tabs open in Private Browsing, but I'll try this soon. For now, let's assume that it turns out the problem isn't with an extension -- i.e., it keeps happening in Troubleshoot mode. Do you have any other guesses for other about:config settings that might be responsible?
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