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I don't know that it's for the exact same script each time, it may be.

A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.

Script: chrome://messenger/content/folderPane.js:721

This is in association with Thunderbird I think.

This doesn't just happen after I've stepped away for a long time. It happens every time I click on anything. Things keep running that I'm clicking on.

Just before this started as a constant problem, I was looking at addons etc, and something in Thunderbird deactivated an old or expired JavaScript. I clicked on the update for that and after a while I found the best choice on the list and clicked download.

I don't know that anything happened with that and I moved away from addons etc area. The unresponsive script window started coming back all the time. Every time I clicked on something in Thunderbird and sometimes with Firefox. I turned off Firefox and restarted, but it didn't change. Shut down Firefox and computer restarted didn't change. The unresponsive script window is persistent now.

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Any of these installed recently Folderpane, CompactHeader, JunQuilla, MoreFunctionsForAdressBook, MRTechToolKit,RemoveDuplicateMessages? Folderpane might have been installed separately or together with another add-on. – Rinzwind Oct 8 '12 at 8:13

Generally unresponsive scripts are caused due to buggy add-ons, or when add-ons are being used in an unintended manner.

The most common solution is to disable all of your add-ons and enable them one by one with intervals of usage until you find out the one causing the issue.

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For Ubuntu 14.04 LTS and Firefox 37.0.2 this is my way of fixing this.

From tools menu, select addons and then, on addons page, select extensions

Disable all extensions and verify that the problem does not occur anymore. Re-enable one extension at a time and detect the one that causes the problem.

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