Disabling images with splinter firefox browser

Could you add code for disabling images with splinter firefox browser?

I am doing this:

browser = Browser('firefox', profile_preferences=proxy_settings)
path = #Given the path
browser.visit(path)
soup = BeautifulSoup(browser.html, 'html.parser')

For faster performance, I want to load pages by disabling the images. I tried editing the "permissions.default.image" parameter to 2 in "about:config" of firefox, but it resets everytime firefox is under remote control.

TL;DR: How do I pass "permissions.default.image" in splinter.browser.visit() request?

Thanks