2 questions, 1st is I'm trying to add an add on and it keeps telling me that an engine already exists 2nd is I rteally like firefox, but it constantly crashes and doesn't browse near as fast or smooth as google chrome

I'm trying to add a shopping add on and it won' t let me. It says something about an engine already exists. Not sure what that means. And wonder why Firefox constantly crashes, my screen flashes, and it runs way slower than google chrome

''guigs2 [[#answer-672422|said]]''
<blockquote>
NoScript stops cookies, please disable this addon/extension as well as make sure that the language en-us is installed.
# 1) Open up the Firefox Preferences tab. You can do this by typing about:preferences in the URL bar.
# 2) Click "Content"
# 3) Next to "Languages", click "Choose"
# 4) Select "English/United States [en-us]", click "Add"
# 5) re-open "about:accounts"
# 6) Click "Get Started"
</blockquote>
Thank you for replying. Unfortunately, I already did all of these things. As you can see from the below screenshot, the language is already set. Also, this screenshot was taken in Safe Mode, so NoScript is not enabled. About:accounts still says I need to enable cookies for some reason. So, this solution didn't work....

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