Re: HyperSnap Extension 4.2 incompatible with FireFox 58.0 (64-bit)?
Is Firefox 58 a beta test version? I just tested my Firefox, it says its ver. 57 and "up to date", and the extension works as well as always. I also don't understand what you mean by "capturing windows". Do you mean maybe some popup windows that Firefox creates on certain pages, if you don't block popups? Or anything else? You could capture such popups with the regular Window Capture or Region Capture functions of HyperSnap, no need for add-on...