Save a MHT site. Safari, Firefox (without add-ons), Chrome: IMPOSSIBLE. M$ IE - extremely slow.
Open 50 -100 tabs, then crash the machine any & every way you can. Which gets you back to your tabs?
Without add-ons, which browser remembers your personal details, blocks ads, lets you tell other sites that you are Firefox, IE or Opera, as the site demands?
Most people do not know what a quality browser is: operates on most operating systems: Symbian, Android, Windows, Linux, etc. the only non-crippleware browser comparable to Opera is Seahorse (Mozilla based).
Not sure why so many people are ignorant of these facts. BTW: I have no connection to Opera, & have never in all my decades paid them a single cent. So, effectively, it has always been freeware.
Retired IT Consultant, Australian Capital Territory.