For a long time, I wanted to try to write my own browser extension, but somehow I couldn't get my hands on it. And finally, the other day I had an idea and free time. At the same time as creating the extension, I decided to write an article in which I will write about the problems I have encountered and the ways to solve them, in addition to the basics of development. Introduction I like to invest small amounts of money in all kinds of investment programs, company shares, etc. A couple of months ago I found a pretty good investment program with an average return of about 10% per month...