- Auto-crop signature images to remove the background, so only the signature overlays your documents. Potentially save the signature for later would be the icing on the cake.
- Add a "check box" tool, and detect the check boxes in the document like Adobe does.
These two features spare us from clumsily drawing things with the trackpad (drawing with the mouse is NOT a solution for anything but dirty annotation. It looks horrible).
These are the things mostly making me go for Adobe. The less frequent tool is the one for filling machine-readable forms where you need to write text in letter boxes in capital letters. Adobe detects it and sizes your letters and letter spacing to enter the boxes.
PS: Great if all of this also works on mobile.
Best regards,
Firefox Firefox Mobile