Agree with recent comments. That is, the loss of some features, after the most recent update, is disappointing. But I will continue to use the add-on.

NOTE THE REASON FOR THE CHANGES ... limitations caused by Firefox's recent update to "Firefox Quantum" v57.0. This update changed the way add-ons/extensions are handled by Firefox. Explanation here: https://support.mozilla.org/en-US/kb/firefox-add-technology-modernizing?as=u&utm_source=inproduct

!!!!!!!!!! HINT BELOW __________Why did you change something what was good? I don't follow... it appears on a different tab, you cannot write down the file wherever you like - what the hell... ? Why ?
HEY PEOPLE - there's solution !!! GO BACK to previous add-on with > Version 5.1.1 - it still works! :)

Nice one but, lacks of Copy to Clipboard option

please make full page capturing and screenshot with scrolling option. TIA