Web developers can use that to check there site for errors. You can ignore errors in the Error Console as a normal user.

WHY IS THIS SUDDENLY COMING UP ON MY COMPUTER TODAY

lightoftheworld, are you having the error console pop up? can you start a new thread please? https://support.mozilla.org/en-US/questions/new

Yes, Tyler
I followed to Mozilla
Which lead me to Microsoft (I think)
Which lead me to a download page claiming to be a plug in for Firefox to work with Microsoft is this ligit?

(flipped uppercase text for legibility)

Please file a new thread using the link I gave above. Also, using all caps make your comments hard to read.

New to this. error console came up which brought me to this page. Further investigation went from Mozilla to a Microsoft link (I think)., claiming to be a plug in necessary from Microsoft to make Firefox function properly. Started download stopped when I was asked permission to download: .... ,exe 2 programs I used print screen to place on email, what went through as gibberish. Unfortunagely I did not write down the names, so I do not have them.

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance/Themes).

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.org/kb/Safe+Mode

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes