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I have an Autohotkey script that gets triggered whenever image data (not text or other data types) is copied to the clipboard.

When I close Firefox, the script gets triggered. This doesn't make any sense to me. Does anybody have an explanation?

Extra info: As for the purpose of the script itself, it is designed to work with the Hypersnap software. You see, I have Hypersnap save each screenshot I take. However, it does not offer the naming scheme I want. Therefore, I use Autohotkey to rename the image after it is saved. I have tried many things, and so far the only way I can get Autohotkey to detect when a new screenshot is taken is by setting Hypersnap to put a copy of the image in the clipboard and have Autohotkey detect that. When this new image data is detected in the clipboard, the script searches the Hypersnap save folder and renames the new screenshot image.

EDIT: It turns out that this question is not even valid as it is stated, because I have discovered that the clipboard contents do not change when closing Firefox, even when the AHK script is triggered as described. The problem lies elsewhere, perhaps with the script itself. I could probably delete this question, but Karan's suggestion to use Greenshot may prove very useful in an indirect way, and I believe it may help others as well.

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Firefox uses screenshots of what you were doing last, to present you with a nifty thumbnail menu of the most recent and most often visited websites. It can present you with this menu page when you open a new tab. – Bon Gart Apr 26 '13 at 23:15
@BonGart: Yes, but surely it doesn't place those screenshots on the clipboard? – Karan Apr 27 '13 at 1:56
Does the same thing happen if you start Firefox in safe mode and then close it? If not then perhaps an add-on is to blame. – Karan Apr 27 '13 at 1:58
@BonGart, in addition to what Karan said, I also don't see why it would be placing the screenshots when you exit the browser. – vertigoelectric Apr 27 '13 at 3:17
@Karan, to be honest, I actually can't seem to reproduce it at all, whether in safe mode or not. It doesn't happen all of the time, and when I posted I wasn't really considering that. I just saw it happen, remembered it has happened multiple times before, and decided to ask about it. I don't close Firefox often, though... – vertigoelectric Apr 27 '13 at 3:22
up vote 0 down vote accepted

Given the discussion above, perhaps switching to Greenshot can be an option. It has advanced file naming syntax you can use which means the malfunctioning AHK script won't even be required:


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Free, open source, intuitive, and lightweight? This seems to be pretty amazing. I've used Hypersnap for so long, though... it'd feel weird switching to something else. Disloyal, even. I'm definitely going to give it a try, though. Thanks for this! While it doesn't solve the mystery and even though my question isn't even really valid any more, this is certainly helpful enough to be accepted as an answer. – vertigoelectric Apr 27 '13 at 22:14
After playing with Greenshot for a little bit, I can certainly say it is nice, but it isn't quite as feature rich as Hypersnap. However, switching over would be give and take. Each has some helpful features that the other does not seem to have. In my line of web design work, I often like to very quickly see what the color of something is, and when using Hypersnap I can start a screen capture and it will tell me the color (in hex or RGB) under my cursor. I use that feature a LOT... – vertigoelectric Apr 27 '13 at 22:32
Why not use a dedicated colour picker tool for that instead of a screenshot utility? Anyway, I'm sure you'll figure out whatever works best for your workflow... – Karan Apr 28 '13 at 0:20
I have considered that option. However there are other differences as well. The color thing was just an example. I'll have to poke around more and find out what I can do. Thanks for the suggestion, though. Nice to know about Greenshot. – vertigoelectric Apr 28 '13 at 5:51

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