Many site issues can be caused by corrupt cookies or cache.

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.

• Delete cookies to remove the information websites have stored on your computer {web link}

• How to clear the Firefox cache {web link}

If there is still a problem,

Start Firefox using Troubleshoot(Safe) Mode {web link}

A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?

While you are in Troubleshoot(Safe) mode;

Try disabling graphics hardware acceleration in Firefox. Since this feature was added to Firefox it has gradually improved but there are still a few glitches.

How to disable Hardware Acceleration {web link}

You can try to disable WebRender. You can set gfx.webrender.force-disabled = true on the about:config page.

You can open the about:config page via the location/address bar. You can click the button to "Accept the Risk and Continue".

• https://support.mozilla.org/en-US/kb/about-config-editor-firefox

Hi FredMcD thanks for your attention . i did delete cookies and clear firefox cash but noting happened but by disabling graphics hardware acceleration it gets better but also some graphics features not works anymore but its good enough thanks again.

hi cor-el i appreciated for your respond i did what you suggest but it didn't work for me thanks again ;)

Start your Computer in safe mode with network support. Then start Firefox. Try Secure websites. Is the problem still there?

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode Starting Any Computer In Safe Mode; Free Online Encyclopedia

If the problem goes away with the computer in Safe Mode, the problem is with one of the other programs on the system.

As a test, disable your protection programs.

Start your Computer in safe mode with network support. Then start Firefox. Try Secure websites. Is the problem still there? http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode Starting Any Computer In Safe Mode; Free Online Encyclopedia If the problem goes away with the computer in Safe Mode, the problem is with one of the other programs on the system. As a test, disable your protection programs.

hi , I test windows safe mode and every things go well so i test my programs one by one then i found out the tuneup was making trouble. thank you a lot my friend

Glad to help. Safe Surfing.

Hello,

I am glad to hear that your problem has been resolved. If you haven't already, please select the answer that solves the problem. This will help other users with similar problems find the solution.

Thank you for contacting Mozilla Support.