The website loads but then everything disappears about betterfox

[yokoffing]

Why did you delete the checkbox that says "The issue persists when using Firefox in Safe Mode."? That's important to know that you've tried that.

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The site works fine for me using:

1. a new Firefox profile
2. a new profile using the latest user.js
3. same profile + with uBO default setup
4. Firefox Nightly

Your screenshot tells me that you have uBO in hard mode, and that will break the site in Firefox. So did you disable this and then clear the cache?

[SampeiNihira]

Even in safe mode there is no change.
So no disturbing extensions.
I use UBO + TLD's but I wrote you that the problem persists if I disable UBO.

It will probably be a setting I changed before using your js.
If you using js only you have the website working.
Sorry for wasting your time.

[yokoffing]

I wrote you that the problem persists if I disable UBO

Yes, but your screenshot showed it still enabled. So I deferred to the screenshot and raised the question to double-check 😄