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
• Make sure that you do not exceed the maximum size of 1 MB

Try to disable OMTC.

• about:config page: layers.offmainthreadcomposition.enabled = false

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config

could not find to upload a snapshot. Here it ishttps://www.dropbox.com/s/4c4cf76t5l0.../mozilla%20not%20diplaying%20properly.jpg?dl=0

What font is used to display this text?

You can right-click on a web page and select "Inspect Element" to open the Inspector (Firefox/Tools > Web Developer). You can check the font used for selected text in the Font tab in the right pane of the Inspector.

• https://developer.mozilla.org/Tools/Page_Inspector

This can be a problem with the font that is used to display the text.

You can do a font test to see if you can identify corrupted font(s).

• http://browserspy.dk/fonts-flash.php?detail=1

You can try different default fonts and temporarily disable website fonts to test the selected default font.

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

Thanks.This thing solved the issue.

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

One of the fonts was not displaying properly. But if I want the websites to display their fonts, shall I uninstall and reinstall the corrupt fonts