I disagree in this case. The majority of Firefox forks make it clear they're a fork, giving credit to Mozilla. Midori seems to hide that they're a fork while adding very little to the browser. Their website also takes donations while having a fake phone number and broken contact button. Hard not to see that as suspicious.

Edit: the dev was also completely ok with Firedragon switching to their codebase because they did so resepectfully.

I still disagree with what the dev did, but I get the struggle.