A networked system includes: a communication device configured to communicate with a computing device executing a browser extension application and a web browser application; a memory storing instructions; and a processor configured to execute the instructions to perform operations comprising: displaying, through the web browser application, a web page on the computing device, the web page being associated with a merchant and including a field requiring population; receiving, through the browser extension application, a secure token mapped to data corresponding to the field, the browser extension application being configured to: (i) detect the field, (ii) automatically populate the field with the secure token sufficient for a financial service provider system to authenticate, (iii) detect a submission script associated with the web page, and (iv) automatically execute the submission script to submit the secure token to the networked system; and transmitting the secure token to the financial service provider system.