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dark blue background makes emails unreadable

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I can't read my emails because of a dark blue background.

This happened

A few times a week

== I tried reading my incoming messages.

I can't read my emails because of a dark blue background. == This happened == A few times a week == I tried reading my incoming messages.

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Check the default colors: Tools > Options > Content : Fonts & Colors: Colors --- Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes). See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems