As a first time user of browserim clicking Screenshot > Save looks like it does nothing.

As it turns out it is actually saving funky timestamped .png's into my home folder.

I think that is a bad default behavior.

Here is my suggestion:

A) prefix the file with browsersim- (making it easier to find)

B) use a ISO date format instead of the current mix of _'s and -'s. i.e. 2013-04-17-103221.png or just 20130417103221.png

C) if user have not set preferences (i.e. blank field) ask the user on his first Save > to specify which folder to save to.

D) on Screenshot > Save show dialog stating the full path of the save file in a way that makes it possible to copy/paste the path (maybe even copy/paste it to the clipboard).

Option D could be made more smooth/better by having something like:

Title: Screenshot saved

Text: Screenshot saved to [filename].

[ ] Copy path to clipboard
[ ] Do this always and do not show this again

[Ok] [Cancel]

And as usual have a "reset dialog settings" in preferences to reset this.

Then on first users they are informed about where the file is saved and can get to it instantly - and experienced users can just dismiss this dialog and have the action they want every time.