Stop Safari constantly clearing cache

Thanks, that's very helpful. What I had in mind was the contents of the Advanced > Developer pane (not the Advanced > Advanced one in the video). Can you post a screenshot of its contents? It may be relevant. If we can't get to the bottom of the problem let me know and I'll post instructions for using EtreCheck.

• Read How to use the Add Text Feature When Posting Large Amounts of Text, i.e. an Etrecheck Report - Apple Community if you want to pursue it.

Don't be alarmed but the site Hosts might want to edit or eliminate that video because it reveals certain information that you may consider personal, which this site's T&Cs recommend against. I won't make that determination myself, after all it's up to you if you want to post that information, but if it disappears don't be concerned... it was sufficient for me to observe what's going on so that I can understand it.

Another uncertainty for me is Google since I don't use their products nor do I have a Google account, nor Hubspot or Facebook for that matter. Obviously I have various other accounts but I can't duplicate the problem with them.

The developer tools shown in Safari's Develop menu is just that — a set of tools for website developers. There is nothing to "switch on" other than that menu. Perhaps you enabled some setting in Developer Tools that clears cache files. If you did that, then reset it to its default setting which doesn't do that. If you don't know how it works then I recommend hiding the Develop menu. Refer to Use the developer tools in the Develop menu in Safari on Mac - Apple Support.

Yes.

Try EtreCheck: How to use the Add Text Feature When Posting Large Amounts of Text, i.e. an Etrecheck Report - Apple Community. It's not exhaustive and may or may not reveal anything actionable.