I'm able to pin fine from within Pinterest, but I seem to be getting the 'Oops...could not save this page' message each time I try to pin anything while outside it using the button. Haven't pinned anything for a few months now. This is happening on literally ALL images I attempt to pin. Had no problems a couple of months ago, something must have changed somewhere along the line.

I am able to pin fine using Chrome. But I don't use Chrome, I use Firefox!

Edit Fri 10 May approx 19:30:

In response to the Developer's reply below (it won't allow me to reply for some reason!)
I'm using a Mac OS High Sierra v 10.13.6, Firefox 66.0.5, I only save to one Pinterest account. Here are 2 URLs I just tried... https://www.amandaclegg.co.uk/portfolio/great-man-not-good-man/
https://thecookingjar.com/honey-garlic-shrimp-skillet/

Edit Sat 11 May 9:10
Hi again. Saving to My digtial art yes, and my Yummly page. Both public. But it happens whichever board I try to save to. Curiously if I use the Pinterest in the social media buttons along the bottom on the image page, it works ok that way.
Content blocking is set at standard. In add-ons I have Ghostery and Autofill but that's it. I tested them out by disabling the add-ons, cleared my cache, but still couldn't save with the button.

9:20 Further to my last message, my partner came along to see what the problem was. I cleared my cache (again) and while in my website, he told me to 'shift refresh'. This seemed to solve the issue! I tried some random websites and I can now save using the Pinterest button again. Thanks for your assistance.