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I can no longer adjust the width of the Bookmarks Sidebar, how do I fix this issue?

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In the past I could hover my mouse arrow over the slider vertical bar to the right of the sidebar and get a 2 headed arrow that I could use to adjust the width of the Bookmarks Sidebar but that stopped working. I need to fix this issue. What do I need to do?

In the past I could hover my mouse arrow over the slider vertical bar to the right of the sidebar and get a 2 headed arrow that I could use to adjust the width of the Bookmarks Sidebar but that stopped working. I need to fix this issue. What do I need to do?

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Maybe something you installed to Firefox messed up that feature.

Do you have that problem when running in the Firefox SafeMode?
http://support.mozilla.com/en-US/kb/Safe+Mode
Don't select anything right now, just use "Continue in SafeMode."

If not, see this:
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+theme...