Page Redirecting to Login & Cookies Problem on Firefox

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This issue make me frustated.
I don't know what's wrong here, but on Firefox MAC, C5 always redirect me to login after second visit.

I always need to clear browser cache & cookies before I can visit the website again.

Other browser doesn't have this problem, only on Firefox.

C5 Version: 8.5.1.

Update:
Sometime happened in Safari

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goesredy
 
ConcreteOwl replied on at Permalink Reply
ConcreteOwl
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goesredy replied on at Permalink Reply
goesredy
There is nothing about third party make the website not working.
Also I can't visit login page after first visit.