What does "Firefox not Responding" mean

Lately I am getting the message on the top of my screen that says, "FIREFOX NOT RESPONDING." Also, there is the little circle icon that goes around and whatever I click on does not open up. I shut off my computer manually, and when I started it up again the messages always say: Do you want to start in Safe Mode.....so that's what I did. Now, the color in my task bar (bottom) changed from blue to black. How can I make it blue again. I have no idea what Safe Mode means but I thought I would try it; I won't do it again!

''ChaCha [[#question-1044789|said]]''
<blockquote>
Lately I am getting the message on the top of my screen that says, "FIREFOX NOT RESPONDING." Also, there is the little circle icon that goes around and whatever I click on does not open up. I shut off my computer manually, and when I started it up again the messages always say: Do you want to start in Safe Mode.....so that's what I did. Now, the color in my task bar (bottom) changed from blue to black. How can I make it blue again. I have no idea what Safe Mode means but I thought I would try it; I won't do it again!
</blockquote>
''ChaCha [[#question-1044789|said]]''
<blockquote>
Lately I am getting the message on the top of my screen that says, "FIREFOX NOT RESPONDING." Also, there is the little circle icon that goes around and whatever I click on does not open up. I shut off my computer manually, and when I started it up again the messages always say: Do you want to start in Safe Mode.....so that's what I did. Now, the color in my task bar (bottom) changed from blue to black. How can I make it blue again. I have no idea what Safe Mode means but I thought I would try it; I won't do it again!
</blockquote>

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