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Another user had a similar problem. Turns out his blocker was causing the issue.

Make sure you are not blocking content.

Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

One issue that seems more common lately is Firefox's Tracking Protection feature. When it is blocking content in a page, a shield icon will appear at the left end of the address bar next to the padlock icon. This article has more info on managing this feature: Tracking Protection {web link}

Soren Barnes said

We have a website. It works fine in version 60.0.2 of Firefox, but if we upgrade to the newest version, it just loads the page (I see it briefly) then it just show a blank page. This happens on both PC and Android tablets.

• On the site's main page only? Other pages of the site also?

• Please provide a link to the site. I have FF 61.0.2 at the moment.

• Like Fred said, it could be an Extension or FF's Tracking Protection (see Options).

• After checking by turning-OFF Tracking Protection and you still have the problem, you can select 'Restart With Add-ons Disabled' to see if the page is still blanking or not.

• If you see the page working when you did the 'Restart With Add-ons Disabled', then it's one of the Extensions (maybe a Theme) causing the issue. Perhaps an Ad Blocker Extension.

~Pj

Having tried to start in Safe Mode, this did not helped, still have the same problem.

Tried to disable all in Tranking Protection, did not work.

The site i am trying to acces is made on a "Windows SharePoint Services 3.0 ".

When I go to page I can see the page quickly in the background and then the page just becomes white,

Soren Barnes said

When I go to page I can see the page quickly in the background and then the page just becomes white,

Place your mouse at one point in the page, hold down the left button, and move the mouse around. Anything happen?

Start your Computer in safe mode with network support. Then start Firefox. Try Secure websites. Is the problem still there?

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode Starting Any Computer In Safe Mode; Free Online Encyclopedia

Soren Barnes said

• Having tried to start in Safe Mode, this did not helped, still have the same problem.

• Tried to disable all in Tracking Protection, did not work.

• The site I am trying to access is made on a "Windows SharePoint Services 3.0".

• When I go to page I can see the page quickly in the background and then the page just becomes white.

• Please provide a clickable link to the site. I have FF 61.0.2 at the moment.

• Have you tried View > Paging Style > No Style?

~Pj