If you use extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) that can block content (Adblock Plus, NoScript, Disconnect, Ghostery, Privacy Badger, uBlock Origin) always make sure such extensions do not block content.

• make sure your extensions and filters are updated to the latest version
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

Firefox shows a purple shield icon at the left end of the location/address bar in case Tracking Protection is blocking content. You can click shield icon for more detail and possibly disable the protection. You can check the Web Console for messages about blocked content. .

• https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop

You can try these steps in case of issues with web pages:

You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• hold down the Shift key and left-click the Reload button
• press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• press "Command + Shift + R" (Mac)

Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Options/Preferences).

"Remove the Cookies" for websites that cause problems:

• Options/Preferences -> Privacy & Security
  Cookies and Site Data: "Manage Data"

"Clear the Cache":

• Options/Preferences -> Privacy & Security
  Cookies and Site Data -> Clear Data -> Cached Web Content: Clear

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.

• switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes
• do NOT click the "Refresh Firefox" button on the Safe Mode start window

• https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

If you use extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) that can block content (Adblock Plus, NoScript, Disconnect, Ghostery, Privacy Badger, uBlock Origin) always make sure such extensions do not block content.

• make sure your extensions and filters are updated to the latest version
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

Firefox shows a purple shield icon at the left end of the location/address bar in case Tracking Protection is blocking content. You can click shield icon for more detail and possibly disable the protection. You can check the Web Console for messages about blocked content. .

• https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop

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You can try these steps in case of issues with web pages:

You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• hold down the Shift key and left-click the Reload button
• press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• press "Command + Shift + R" (Mac)

Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Options/Preferences).

"Remove the Cookies" for websites that cause problems:

• Options/Preferences -> Privacy & Security
  Cookies and Site Data: "Manage Data"

"Clear the Cache":

• Options/Preferences -> Privacy & Security
  Cookies and Site Data -> Clear Data -> Cached Web Content: Clear

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.

• switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes
• do NOT click the "Refresh Firefox" button on the Safe Mode start window

• https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

Thanks for the above, I tried all of the options to no luck; still unable to get the login details to appear.

Please provide a public link (no password) that we can check out. No Personal Information Please !

Remove History For One Site {web link}

Open the History Manager <Control> (Mac=<Command>) <Shift> H.
In the search bar, enter the name of the site. Right-click on one of the listings and select
Forget About This Site.
This should remove all information, including any site settings

You can check the Web Console for messages about blocked content.

• "3-bar" menu button or Tools -> Web Developer
• https://developer.mozilla.org/en-US/Tools/Web_Console
• https://developer.mozilla.org/en-US/Tools/Network_Monitor

Please provide a public link (no password) that we can check out. No Personal Information Please ! Remove History For One Site {web link} Open the History Manager <Control> (Mac=<Command>) <Shift> H.
In the search bar, enter the name of the site. Right-click on one of the listings and select
Forget About This Site.
This should remove all information, including any site settings

I have already removed the history for the site and no luck.

Website is: https://music.apple.com/gb/browse and the click the 'Log In' button at the top right. For me this just brings a white box that just spins and doesn't go anywhere no matter how long I leave it,

You can check the Web Console for messages about blocked content.

• "3-bar" menu button or Tools -> Web Developer
• https://developer.mozilla.org/en-US/Tools/Web_Console
• https://developer.mozilla.org/en-US/Tools/Network_Monitor

Web Console after clicking on the 'Log In' button:

- Metrics config: no config provided via delegate or fetched via init() - Cookie "media-user-token" will be soon rejkected because it has the "sameSite" attribute set to "none" or an invalid value - Content Security Policy: Ignoring 'x-frame-options' because of 'frame-ancestors' directive.

Not sure if these mean anything to you? Also noticed that certain websites keep thinking I am a bot and making me do Captcha checks

Please provide a public link (no password) that we can check out. No Personal Information Please ! Remove History For One Site {web link} Open the History Manager <Control> (Mac=<Command>) <Shift> H.
In the search bar, enter the name of the site. Right-click on one of the listings and select
Forget About This Site.
This should remove all information, including any site settings

No Luck on this front, I had tried that previously but it still doesn't load.