Grammarly is also a large and well established tech company. Pretty sure they’ve been around for 12+ years at this point, and I think have multiple hundreds of staff.
Are you looking very specifically for “ONLY 7 figures”?
Revenue, or profit?
Not hard to think of a handful of big players in revenue; 1Password and Honey spring instantly to mind as 9-figure revenue players.
I am interesting to know if a solo developer can make a living, 6/7 figures, producing and monetizing extensions.