Hello, I am suspicious of some of your extensions, so please Try Firefox Safe Mode to see if the problem goes away. Firefox Safe Mode is a troubleshooting mode that temporarily turns off hardware acceleration, resets some settings, and disables add-ons (extensions and themes).

If Firefox is open, you can restart in Firefox Safe Mode from the Help menu:

• Click the menu button , click Help and select Restart with Add-ons Disabled.

If Firefox is not running, you can start Firefox in Safe Mode as follows:

• On Windows: Hold the Shift key when you open the Firefox desktop or Start menu shortcut.
• On Mac: Hold the option key while starting Firefox.
• On Linux: Quit Firefox, go to your Terminal and run firefox -safe-mode
  (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)

When the Firefox Safe Mode window appears, select "Start in Safe Mode".

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, theme, or hardware acceleration. Please follow the steps in the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article to find the cause.

To exit Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

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If the problem is caused by an extension, once it has been removed/disabled, you may need to run SearchReset to revert your settings.

Troubleshoot Firefox issues caused by malware may also be helpful.

When you figure out what's causing your issues, please let us know. It might help others with the same problem.

I agree with the above actions.

Hi - here is what happened. There are two different ways around the yahoo scurrage:

A. Over the past 2 or 3 days, the download version of the North American version FF V 38.0.1 has been modified to include an App, titled "Default Search Engine 3.3". So, click on "Tools", then "Add-ons". Then adjust this Add-on to (e.g.) Google. I have re-started the browser, and the search engine choice seems to hold.

B. Mozilla/Firefox has signed some sort of deal with yahoo to promote yahoo search engine. This only applies to the North American edition of FF. For example, the German one does not have this gimmick. It stands to reason the the UK English version can also be made "yahoo-free".

If you chose solution "B", then you may find it necessary to manually load in the local versions of any other search engines which you find necessary, e.g. amazon or whatever.

Since someone at Mozilla had obviously adjusted FF V 38.0.1 to circumvent the "Google Default" search engine, I am however concerned that something similar will happen WRT the "Default Search Engine 3.3" App. And so before updating to any future versions beyond FF V 38.0.1, I would suggest keeping a back-up installer for V 38.0.1.

I beg to differ. While Default Search Engine {web link} is listed in Mozilla's Add-ons web site, it is not downloaded with Firefox. I am in Connecticut, and my add-ons do not include that one.

You may have installed it but forgot.

You are possibly correct. Are you running V 38.0.1? Main thing is that this App seems to be fulfilling its intended function - at least for now.