this addon seriously slows down firefox

[GoogleCodeExporter]

What steps will reproduce the problem?
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What is the expected output? What do you see instead?


What version of the product are you using? On what operating system?
38.0.5

Please provide any additional information below.

My firefox became really slow and today I tried find out the culprit by 
deactivate each of my addons and hide-bookmarksbar was the culprit. I think it 
happened since the update to version 38.

Original issue reported on code.google.com by [email protected] on 16 Jun 2015 at 12:11