Since it is the best in what it does, I have to give it five stars.

It would be even better if it did not require the "access-your-data-for-all-websites" permission, but I being it "recommended" (and therefore I hope checked) by Firefox, I trust it.

For details on the dangerous permission, see:
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https://support.mozilla.org/en-US/kb/permission-request-messages-firefox-extensions#w_access-your-data-for-all-websites

The extension can read the content of any web page you visit as well as data you enter into those web pages, such as usernames and passwords.

Awesome tool.

I can't live without Singlefile.

Just WOW!
It's a great alternative to cloning sites using wget (tedious!) and can save any website, except for some complex dynamic sites.

Great. It also correctly and completely saves pages that were incomplete with other saving systems (if necessary change some options, such as Images - 'Maximum idle times' and 'Zoom out page')

Custom settings keep getting reset.