Intermittent "Page could not be loaded"

Not sure what this means or how to do it.
To open the console in Chrome, do one of the following tasks:
  1. Right-click any page element and select Inspect Element. Click the Console tab.
  2. Using a keyboard shortcut, open Developer Tools and bring focus to the console. Windows: Ctrl + Shift + J. Mac: Cmd + Opt +J.
 
To open the console in Chrome, do one of the following tasks:
  1. Right-click any page element and select Inspect Element. Click the Console tab.
  2. Using a keyboard shortcut, open Developer Tools and bring focus to the console. Windows: Ctrl + Shift + J. Mac: Cmd + Opt +J.
Using Firefox mostly. It doesn't seem to happen in MS Edge.
 
See if this helps:
 
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