Weird, inexplicable display artifacts make me think of potential graphics drivers incompatibilities. You can minimize this issue by disabling Firefox's use of hardware graphics acceleration.

You usually need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).

orange Firefox button (or Tools menu) > Options > Advanced

On the "General" mini-tab, uncheck the box for "Use hardware acceleration when available"

If you restart Firefox, is the issue resolved (or at least improved)?

Thanks for suggestion but no luck. I tried 2 web sites but there is no improvement at all.

Note that a reset tries to import cookies.

Clear the cache and the cookies from websites that cause problems.

"Clear the Cache":

• Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Firefox/Tools > Options > Privacy > Cookies: "Show Cookies"

If clearing cookies doesn't work then it is possible that the cookies.sqlite file that stores the cookies is corrupted.

Rename (or delete) cookies.sqlite (cookies.sqlite.old) and delete other present cookie files like cookies.sqlite-journal in the Firefox profile folder in case the file cookies.sqlite got corrupted.

• http://kb.mozillazine.org/Cookies
• https://support.mozilla.org/kb/Deleting+cookies

Thanks for more detailed help but still no improvement at all. I followed every suggestion you made.

Is there anything else I can try?

can you test this in a new profile?

• Profile Manager - Create, remove or switch Firefox profiles

Thanks for continued help and support.

I have removed (2) old profiles, after saving them and created a completely new one with no bookmarks. This I am afraid has made no difference to the appearance of websites.

Is there anything else I can try?

boot into windows safe mode.

• http://windows.microsoft.com/en-us/windows/start-computer-safe-mode

and see if it resovles.

Can you attach a screenshot?

• http://en.wikipedia.org/wiki/Screenshot
• https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem

Use a compressed image type like PNG or JPG to save the screenshot.

Hopefully I have provided an image showing an incomplete Amazon web page. This shows how the information on the right hand side of the page relating to adding to the basket and purchase, are missing.

I have not yet tried to open in safe mode.

Make sure that you haven't enabled a High Contrast theme in the Windows/Mac Accessibility settings.

Make sure that you allow pages to choose their own colors.

• Tools > Options > Content : Fonts & Colors > Colors : [X] "Allow pages to choose their own colors, instead of my selections above"

Note that these settings affect background images.

See also:

• http://kb.mozillazine.org/Website_colors_are_wrong

Note that some of those images are sprites that contains several of them.

• http://g-ecx.images-amazon.com/images/G/02/gno/beacon/BeaconSprite-UK-02._V397961423_.png

If images are missing then check that you aren't blocking images from some domains.

• Press the F10 key or tap the Alt key to bring up the hidden "Menu Bar" temporarily.

• Check the permissions for the domain in the currently selected 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 "Tools > Page Info > Media" for blocked images
• Select the first image link and use the cursor Down key to scroll through the list.
• If an image in the list is grayed and "Block Images from..." has a check-mark then remove this check-mark to unblock images from this domain.

Make sure that you do not block third-party images, the permissions.default.image pref on the about:config page should be 1.

Make sure that you haven't enabled a High Contrast theme in the Windows/Mac Accessibility settings.

Make sure that you allow pages to choose their own colors.

• Tools > Options > Content : Fonts & Colors > Colors : [X] "Allow pages to choose their own colors, instead of my selections above"

Note that these settings affect background images.

See also:

• http://kb.mozillazine.org/Website_colors_are_wrong

There are extensions like Adblock Plus (Firefox/Tools > Add-ons > Extensions) and security software (firewall, anti-virus) that can block images and other content.

See also:

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
• http://kb.mozillazine.org/Images_or_animations_do_not_load
• http://kb.mozillazine.org/Websites_look_wrong

If I override page colors, I get a very similar display.

By the way, I'm a bit concerned that your address bar has a green background but it is not secure connection to the site. Is it always green, or is there a problem with an add-on that is supposed to color secure site addresses differently?

I haven't yet had time to work through all the latest suggestions .

Regarding the green colouring, this was my choice when I recently amended several size and colour settings in Windows display.

I do not understand the remark that my address bar is not a secure connection to the site. How doI correct that please?

Hi Keith, regarding the connection to the site, I'm sure you've noticed that on some sites Firefox displays a lock icon to the left of the URL in the address bar. That happens on this site, for example.

Occasionally you see not just a gray padlock, but a green one with a company name. This is because the site has an EV (extended validation) certificate assuring you that the site is under the control of a particular company.

Some browsers put a green background color in the address bar when you are viewing a secure page on a site with an EV certificate. So I just wanted to note that if the bar is always that color, you can't rely on that background color to determine how secure your connection is with the site.

As for whether you can connect more securely, the answer is, "sometimes." On many sites you visit, you probably don't care about a secure connection, i.e., your submissions and the pages you get in return don't need to be confidential. If it's a site you think should use a secure connection, you can try changing the HTTP to HTTPS in the address bar. Many sites will error out if you do that, but it might work for the ones that are more privacy conscious.

I am still working my way through other helpful suggestions.

I opened in Safe Mode (with networking) as I could not get web connection in pure safe mode, but the fault was still there.

Did you check the high contrast setting in the Windows Accessibility settings in case the setting in "Options > Content > Colors" is correct?

• http://windows.microsoft.com/en-US/Windows7/Make-the-computer-easier-to-see-optimize-visual-display

I have checked to ensure that high contrast setting is NOT operating

But did you turn on the option shown in the screen shot in this post? https://support.mozilla.org/questions/967382#answer-466864

I am sorry but I don't understand the option I should have turned on before checking the high contrast setting.

I have however carried out all the earlier instructions ending with the about:config setting which is 1.