A-Frame is said to be named after a cave's opening resembling the letter A.

Are you using AdBlock? You can open its browser extension from this page.

The browserextention can most often be found in the top-right of your browser. When you click on the extension AdBlock in the browser Chrome you will see this.

Then you would like to pause ('Pause on this site') the AdBlock browser extention for this site. You are doing so by pressing the button 'Always'. Now advertisements can be shown on all pages of greatestdivesites.com.

Read more on the help page of AdBlock.

Are you using AdblockPlus? You can open its browser extension from this page.

The browserextention can most often be found in the top-right of your browser. When you click on the extension AdblockPlus in the browser Chrome you will see this.

Then you would like to disable the AdblockPlus browser extention for this site ('This website'). You are doing so by sliding the blue selection button to left and making it grey. Now advertisements can be shown on all pages of greatestdivesites.com.

Read more on the help page of AdblockPlus.