How to prevent "your search settings have been restored to their setting defaut" ?

Les moteurs de recherche se réinitialisent à chaque ouverture d'une page firefox, me ramenant le moteur de recherche yahou que je ne veux pas, avec le message suivant "your search settings have been restored to their setting defaut" ! Comment empêcher cela ?

Do you have security software that might reset the search settings?
Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
You can use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
See also http://kb.mozillazine.org/Preferences_not_saved and [[Preferences are not saved]]

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