Firefox will become the only major Android browser to support an open extension ecosystem. For the past few years Firefox for Android officially supported a small subset of extensions while we focused our efforts on strengthening core Firefox for Android functionality and understanding the unique needs of mobile browser users. We anticipate considerable user demand for more extensions on Firefox for Android, so why not start optimizing your desktop extension for mobile-use right away?

Source: Prepare your Firefox desktop extension for the upcoming Android release

Let’s hope this brings some real competition to this space.