userscripts - How to inject JavaScript into a page in my browser to customise a web page? -


idea , question

i looking functions amounts javascript injectection, safer. idea can observed broswer's console , start noodling document.getelementbyid('btnsubmit').value = 'i took on button'; after quick inspection of site in question. amend established website local machine purpose of pre-filling fields exercise of efficiency in work process.

background

i aware of issue of xss, howerver, javascript seems best candidate accessing elements document read in browser, , javascript injection feasible method of sort of accomplishing idea, that's limited perspective. many of processes in question requires duplicate data input in more 1 system @ least 1 of data input sources @ least controllable proprietary server-side language. open suggestion, however, think question interesting.


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