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Sexy Undo Close Tab
Sexy Undo Close Tab is a great little extension. It keeps track of tabs you've closed, a lot of tabs you've closed. Right now, it's tracking the most recent 276 tabs I've closed on my browser.
The tool has a lot of options, including one you're probably going to want to turn off. Sexy Undo Close Tab is ad supported, which is fine. As I've mentioned, I make part of my living being supported by ads, so I certainly support the practice. The only problem is that Sexy Undo Close Tab sticks ads in the most unlikely of spots, like dialog boxes in the middle of QuickBooks, and in the corporate CMS.
As much as I like the tool, and would like to see the author supported, I'm going to have to recommend you go to the options and check "I don't want to support you or this extension".
To the author of the extension, I'm going to request you find a better way to present ads. Maybe check the size of the window before you show an ad, or not show ads on https pages. I'd like to support you, and your software works quite well -- except your ad system breaks other stuff I need to use. Not sexy. Not sexy at all.
How often used: A few times a week.
Live without it factor: I could live without it, and if I couldn't stop it from breaking some of the Web apps I used, I would have stopped using it. Kudos to the author for allowing that option to be turned off, even though he'd give my grandmother's guilting skills a run for the money.