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In the last few days, I've encountered a problem with scrolling with my up & down keys. The up & down keys seem to, now function as Home & End keys. MyPage Up & Page Down keys seem to do nothing. What is wrong?

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In the last few days, I've encountered a problem with scrolling with my up & down keys. The up & down keys seem to, now function as Home & End keys. MyPage Up & Page Down keys seem to do nothing. What is wrong?

In the last few days, I've encountered a problem with scrolling with my up & down keys. The up & down keys seem to, now function as Home & End keys. MyPage Up & Page Down keys seem to do nothing. What is wrong?

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Hit the F7 key, you probably have Caret browsing turned on.

http://kb.mozillazine.org/Accessibility.browsewithcaret