When I click on a link within a Web page, Firefox just spins until I reload the new page.
When I enter a new URL or select a bookmark, Firefox loads the page promptly. When I click on a link within that page to go to another page, the Firefox tab green spinner often just spins and spins. It either takes a very long time to load (2 or more minutes), or never finishes loading. It's usually a greater problem when I "Open a link in a new tab". I can usually make the new page appear by reloading, either clicking the red X and the circular arrow, or Ctrl-F5, etc.