I am a user of your Google Chrome Extension Autofill (https://chrome.google.com/webstore/detail/autofill/nlmmgnhgdeffjkdckmikfpnddkbbfkkk/reviews) and I Loved this Extension, it's an awesome tool which saves a Lot of time while filling forms.
Now without wasting much time, I'm coming to the Objective.,
MY MAIN OBJECTIVE IS TO FILL A ONLINE FROM WITH SOME FIELDS (Like NAME, DOB, PASSWORD, ETC.) WITH FIXED DATA (Extension Already Capable) AND FEW FIELDS (Like USERNAME, ADDRESS, MOBILE NUMBER, ETC.) WITH CUSTOMIZED RANDOM DATA (Here UPDATE REQUIRED).
Random Data will be according to Data Type of the Field., It Should Generate a Random Number for Mobile Number Field between the Range Specified by User (for Example it should Auto Generate and Autofill Mobile Number Field with 94XXXXXXXX when User specifies Range for Mobile Number Field (9400000000,9499999999). Similarly It should APPEND the Address Field with Some Randomly Generated House Number including Number and Alphabets (H No. AK876/67B) both, and So is the Username.