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 Use Troubleshoot Mode in Firefox 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.