Have you tried Pale Moon? It was initially based on firefox but abandoned it when FF introduced Australus UI to make itself look more like chrome. It gets regular security patches and has an active developer.

thanks for posting the article, ouc.
Forgot to mention that the address bar in both Opera and Vivaldi does do a keyword search using the search engine that you select as a default. Both come with ability to use about 7 search engines and you can add more if you wish. You can select a different engine from the default on the fly by prefacing your keywords with a one letter code and a space. For example, google is 'g', yahoo is 'y', startpage is 's', etc.

Thanks for your response.

Been using Opera for many years, but the developers bailed out about 3-4 years ago because their coding couldn't process pages as quickly as Chrome. Most browsers now use the Chrome engine. Unfortunately Opera lost all the special features that made it the best browser regardless of speed when they switched and they still haven't restored them. So I use an old opera browser 12.17 for features as first choice even though it is not being updated.
(Mozilla browser doesn't have the features either, so don't suggest I try it again.)
The original developers of Opera left to create their own browser when the switch to chrome occurred and they created Vivaldi. It has most of the Opera features I liked and is fast and reliable.

Opera (old ver 12.17) has a spell checker (right-click) that I use sometimes when typing a post but it doesn't make suggestions for spell correction.