Fira Code supports stylistic sets, so you can actually configure whether == and === (and != and !==) do that, and leave weirder ligatures out of the defaults. I

Fira Code supports stylistic sets, so you can actually configure whether == and === (and != and !==) do that, and leave weirder ligatures out of the defaults. In VS Code, for example, you would change editor.fontLigatures from true to "'ss08'" to make them still ligate together, but with breaks between the = signs. I use ss06 to make backslashes faded when they're used to escape other characters.