I get a black screen when trying to open icloud for my mac mail
Also on some websites, the pictures do no show.
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Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
- Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
"Remove Cookies" from sites causing problems:
- Tools > Options > Privacy > Cookies: "Show Cookies"
Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance/Themes).
- Don't make any changes on the Safe mode start window.
- https://support.mozilla.org/kb/Safe+Mode
Make sure that you allow pages to choose their colors and that you haven't enabled High Contrast in the Accessibility settings.
- Tools > Options > Content : Fonts & Colors > Colors : [X] "Allow pages to choose their own colors, instead of my selections above"
If images are missing then check that you aren't blocking images from some domains.
- Check the permissions for the domain in the current tab in "Tools > Page Info > Permissions"
- Check that images are enabled: Tools > Options > Content: [X] Load images automatically
- Check the exceptions in "Tools > Options > Content: Load Images > Exceptions"
- Check the "Tools > Page Info > Media" tab for blocked images (scroll through all the images with the cursor Down key).
If an image in the list is grayed and there is a check-mark in the box "Block Images from..." then remove that mark to unblock the images from that domain.
Make sure that you do not block third-party images, the permissions.default.images pref should be 1.
There are also extensions (Tools > Add-ons > Extensions) and security software (firewall, anti-virus) that can block images.