Linux w/ Firefox not showing Marketo forms but using Chrome, the user can see the form. Anyone else experienced this? Our target is developers so having it work on a Linux machine is important
A basic form works fine for me in FF38/Ubuntu.
You're going to have to dig deeper. Are there messages in the browser console?
Firefox blocked marketo content. Inside our page source code it instruct to download the following script:
Those checkboxes are checked by default in Firefox, and the screenshot I sent you is from a default (untweaked) installation of Firefox 38 on Ubuntu.
In addition, the list of sites consulted by Firefox on Linux and on Windows is the same: they use the same Google Safe Browsing database used by Chrome. If you look up marketo.com you'll see it isn't currently listed.
I assume there is something wrong with that Firefox installation and no general cause for alarm. Reinstall FF on your test box and try again.