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Why is the appearance of a specific different on two different computers that I use?

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The normal appearance should be with the various pages displayed horizontally. On one computer, they have started to appear vertically and are semi-obscured. On a third machine it appears correctly. It also appears correctly through IE8

The normal appearance should be with the various pages displayed horizontally. On one computer, they have started to appear vertically and are semi-obscured. On a third machine it appears correctly. It also appears correctly through IE8

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  • "Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
  • "Remove the Cookies" from sites that cause problems: Tools > Options > Privacy > Cookies: "Show Cookies"

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).

  • Don't make any changes on the Safe mode start window.

See:

If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.

  • Use "Disable all add-ons" on the Safe mode start window to disable all extensions.
  • Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
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Thanks. Worked immediately.