No problem! Great motivation behind building the extension (not coincidentally, it's the same reason I initially used the LinkedIn setting!), and a cool project. :)
I responded on Medium as well, but you can also enable this setting on LinkedIn, though admittedly it's tucked away. :)
1. Log into your account on linkedin.com.
2. Hover over your photo in the upper right, and go to manage Privacy & Settings.
3. Select the Account tab.
4. Set the option “Show/hide profile photos of other members.”
"Out beyond ideas of wrongdoing and rightdoing, there is a field. I'll meet you there."
This is one of my favorite quotes - first came across it while reading "And the Mountains Echoed". I'll definitely have to check out more of Rumi's works.