selenium.common.exceptions.SessionNotCreatedException: Message: Unable to find a matching set of capabilities with Firefox 46 through Selenium

I must have some versions here that don’t match up since I can’t get Selenium with Python to fire up a Firefox web browser. I’m using an older version of Firefox because other people in here have the same old version of Python and for them the old version of Firefox works best.

Using Extensions with Selenium (Python)

I am currently using Selenium to run instances of Chrome to test web pages. Each time my script runs, a clean instance of Chrome starts up (clean of extensions, bookmarks, browsing history, etc). I was wondering if it’s possible to run my script with Chrome extensions. I’ve tried searching for a Python example, but nothing came up when I googled this.