FireFo.png = https://i.imgur.com/FQcmuBx.png Chrome.png = https://i.imgur.com/nxmDvmG.png

Can you post a link to that page for us to check out? Make sure you are not blocking content. https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop also see https://blog.mozilla.org/security/2021/03/23/introducing-smartblock/ https://support.mozilla.org/en-US/kb/smartblock-enhanced-tracking-protection --------------- [https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode Diagnose Firefox issues using Troubleshoot(Safe) Mode] {web link} A small dialog should appear. Click '''Start In Troubleshoot(Safe) Mode''' (not Refresh). Is the problem still there? Many site issues can be caused by corrupt cookies or cache. '''Warning ! ! ''' This will log you out of sites you're logged in to. You may also lose any settings for that website. * [https://support.mozilla.org/en-US/kb/delete-cookies-remove-info-websites-stored Delete cookies to remove the information websites have stored on your computer] {web link} * [https://support.mozilla.org/en-US/kb/how-clear-firefox-cache How to clear the Firefox cache] {web link}

Dear [[FredMcD|FredMcD]], Thanks for your beautiful help. FireFox support is great. I tried your solutions in your answer. Finally i figured out the problem. I have two accounts on YouTube. In account 1 design is incorrect. After switch to account 2 design is correct. i think problem is for cookies. By the way thanks again. There is no problem about this version of FireFox.

Glad to help. Safe Surfing.