I'm using the free version on a 2015 iMAC with Mojave. It generally provides a result that accurately reproduces how the page looks in the browser. It is better at doing this than the native print-to-pdf capabilities of the MacOS/Firefox combo. It's at least as good as any other plugin of this kind that I have tried, on any browser on this same computer. The plug-in has sustained this level of functionality for several years -- I think I first started using it in 2016. Best feature other than the fact that it works is that you can customize file names, including using sequential numbers within filenames (e.g.: [today'sdate]+[domainname]+[n], then [today'sdate]+[domainname]+[n+1]). This allows you to skip the Save-As dialog (using another preference option) most of the time. Every once in a while I run into a page with weird scripting or multimedia elements which this plug-in can't reproduce accurately. Usually I'll find that the same page causes problems with all the tools available to me; but sometimes one of the others will work better. No tool works on everything. Very long scrolling pages (e.g., several months of a Facebook newsfeed) can take a long time, may temporarily use a lot of RAM, and Firefox may throw up error messages which I ignore. Usually I can keep doing other things, and the end result is usually a good reproduction of that very long page. Every once in a while I ask too much and have to abort through firefox, or restart firefox.