Accessibility/Mobile/AccessFu

AccessFu is the Javascript, in-browser assistive technology that provides accessibility on Firefox Mobile and Boot To Gecko.
It injects "content-script.js" to opened browser element via frame message manager and translate some user inputs like gesture or keyboard input to actions command then notices the browser element to update the focused element.

Testing

When Android accessibility is set up, and TalkBack is enabled, you should be able to navigate pages with the DPad up and down arrow keys and activate items with the center key.

Also, if you are on desktop, and want to see mess around with AccessFu, you could get this this extension.

Reporting Bugs

Here is a prefilled form.