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Why does Style Editor suddenly open while I'm typing?

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If I am typing in a form field, email, or other document while using Firefox, the Style Editor will suddenly open for no reason. I am typing normally, and do not hit any unusual key combinations. It seems to happen when I AM TYPING in CAPS, which is annoying, as you can see. I use Yahoo mail in Firefox and this happens frequently while I am composing. And it has just started happening in the past few days after rebooting my computer. I use WIN 7 and have the latest Firefox update. Any suggestions?

If I am typing in a form field, email, or other document while using Firefox, the Style Editor will suddenly open for no reason. I am typing normally, and do not hit any unusual key combinations. It seems to happen when I AM TYPING in CAPS, which is annoying, as you can see. I use Yahoo mail in Firefox and this happens frequently while I am composing. And it has just started happening in the past few days after rebooting my computer. I use WIN 7 and have the latest Firefox update. Any suggestions?
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