Hi jonial, what is the address of that home page? If it's not shown in the address bar, you can extract that using the Page Info dialog. Either:

• right-click (on Mac Ctrl+click) a blank area of the page and choose View Page Info
• (menu bar) Tools > Page Info
• click the padlock or "i" icon in the address bar, then the ">" button, then More Information, then the General icon

To copy the address, you can triple-click it to select it fully then use either Ctrl+c or right-click > Copy.

This article lists various things to check for sessions that get changed or reverted between sessions: How to fix preferences that won't save. However, depending on the specific page you get, one of the potential culprit may be more likely than the others...

Hi jscher2000 The address of the page is :- https://support.mozilla.org/en-US/kb/page-info-window-view-technical-details-about-page?eu=1&redirectlocale=en-US&as=u&redirectslug=Page+Info+window&utm_source=inproduct#General

This appears to be the default home page. I have tried various suggested solutions but my prefered homepage which is www.google.co.uk does not get saved but is overwritten by Firefox

https://support.mozilla.org/en-US/kb/how-to-fix-preferences-wont-save

Note: Some software, like Advanced SystemCare with Surfing Protection, can protect files in the Firefox profile folder against changes. If you have such software then check the settings or uninstall this software.

Hi jonial, it seems you somehow ended up in a help article. I'm attaching a screen shot of the built-in Firefox home page and how its address appears in the Page Info dialog. Is that the one you're getting?

If you go the Options page when this happens, what is your startup setting? For example, is your home page erased and Firefox shows the italic placeholder text shown in the attached screenshot?

In that case, please see the article I mentioned earlier listing possible explanations for your preferences to get erased or rolled back between sessions: How to fix preferences that won't save.

I have cured this problem. I completely uninstalled Firefox and then re-installed it Thank you to all who reponded

That was very good work. Well done.