Blank page when using joomla module addon

Hi Toufiq,
I still have the problem but I found out only I have it.
It still generates the same blank page on my firefox (the one I mainly use) but it works on chrome and firefox when used in another computer. I use the same firefox account with shared parameters across all platforms.
Meanwhile I put it online :
https://www.theatre14.fr/index.php/universite-populaire
Do you know what the problem could be ?
Thanks

Well my problem is a blank page on firefox, so compared with chrome, it shows as following screeshot

Well my problem is a blank page on firefox, so compared with chrome, it shows as following screeshot

Hi. I checked your page. This problem happens from time to time. If I reload it after getting a blank page, the content appears. In this regard, I have an assumption. Save the Html Row addon containing the youtube video (so you can restore this). Remove this addon from the page and check. It looks like the problem comes from youtube embed code.

Hi Pavel,
Thanks for your answer.
It didn't do the trick. I still have a blank page after deleting the embeded video.
The only way fo the page to load content in my firefox is to delete or disable any Joomla module add-on or other addon containing one (Tabs in this case).

Toufiq, i see you're using a mac, could it make a difference ? I recently had this kind of issue using a css customed horizontal navbar. Didn't show in firefox on a mac as it automatically hides it by defaut in system preferences (and moz doesn't use webkit).