Just to correct the common misconception. It is browser vendors that need to build web extension API support on top of WebKit. Orion browser [1] did this both for macOS and iOS . The support is still in beta and improving with each new release. iOS support remains limited to what is possible to achieve with a JS wrapper. Nothing prevents Firefox from doing the same and offer at least partial web extension support on iOS.
Just to correct the common misconception. It is browser vendors that need to build web extension API support on top of WebKit. Orion browser [1] did this both for macOS and iOS . The support is still in beta and improving with each new release. iOS support remains limited to what is possible to achieve with a JS wrapper. Nothing prevents Firefox from doing the same and offer at least partial web extension support on iOS.
[1] https://kagi.com/orion