I'm running the latest Firefox as my browser on Windows 10 Professional ACER laptop (a bit old). I have encountered today an error that seems to be associated with the notepad scode that I keep up for the various Holidays. The notepad has taken over the page and pushed the content for the various pages all the way down to the bottom of the pages....I have jpgs of this if you need evidence.

Have "toggled the sidebar" about 5 times. The fifth time seemed to have helped...you can close this topic.