this seems to be working fine on chrome, but not on Firefox. why!!!!!

@jespersh i have not enabled a single thing. everything is default and it's my first time after a long time am firing up Firefox.

Cannot reproduce.

@necromancer i think Firefox had some tracking content blocked by default now.

You can make exceptions per site or turn off the default in settings

Firefox aggressively blocks stuff, even without uBlock Origin or Ghostery.
I noticed that many sites just stopped working when opened in FF... and most of them don't even have tracking... One page, which was basically a glorified download and documentation page for some fancy vue.js components had really nice animation scripts and even those got blocked (hiding like 80% of the content in the process)

Works well on my Firefox 71.0 with a lot of tracker blockers installed