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My website suddenly won't load

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I've used Firefox to access my website for years. Suddenly this morning, it won't load after I've signed in. Before logging in, everything looks normal. After logging in, the home page does not load completely and I cannot navigate through the site. I tried on Safari and everything works normally.

I've cleared the cookies and cache, re-started Firefox, even re-started the computer. No luck. The website host thinks it's a firefox issue.

My Firefox version is current (78.1.0esr (64-bit)). I'm on Mac OS 10.11.

I've used Firefox to access my website for years. Suddenly this morning, it won't load after I've signed in. Before logging in, everything looks normal. After logging in, the home page does not load completely and I cannot navigate through the site. I tried on Safari and everything works normally. I've cleared the cookies and cache, re-started Firefox, even re-started the computer. No luck. The website host thinks it's a firefox issue. My Firefox version is current (78.1.0esr (64-bit)). I'm on Mac OS 10.11.
Attached screenshots

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BTW - I disabled all add-ons, but that did not help. However, when I log in a private window it does work! So wth is wrong with my browser?

Any ideas? Thanks!

Modified by Najib Joe Hakim