Using the HTML Validator for Firefox, I have found that every page I open has errors, not just the ones I have designed; why?

Even using it on this page there are 5 errors geneated.
I am using HTML Tidy.
Is there something wrong? Am I using it incorrectly?

I checked and agree this page does not pass validation
* http://validator.w3.org/unicorn/check?ucn_uri=https%3A%2F%2Fsupport.mozilla.org%2Fen-US%2Fquestions%2F992639%23answer-551039&doctype=Inline&charset=%28detect%20automatically%29&ucn_task=conformance#
That validator is an official w3.org validator
*http://simple.wikipedia.org/wiki/World_Wide_Web_Consortium
* http://www.w3.org/
I suppose it could be expected these pages would pass validation. I will mark this for escalation lets see what HelpDesk's observations are on that.
I also note that ''html tidy'' appears to be a utility originating from w3.org
* http://www.w3.org/People/Raggett/tidy/
As for your own problems with web design that would best be discussed elsewhere. <br />Ordinarily I would say a Mozillazine forum may be a good place to try
* http://forums.mozillazine.org/viewforum.php?f=25
Now that Webmaker have a presence on this forum it may actually be worth asking again and specifically asking from
* https://support.mozilla.org/en-US/questions/new/webmaker
IF you are attempting to use any Webmaker advice or product
* https://webmaker.org/

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Crash ID: bp-fa9da320-92dc-47f7-afff-33e702120718
AdapterDeviceID: 0x2a02
AdapterVendorID: 0x8086
Add-ons: {972ce4c6-7e08-4474-a285-3208198ce6fd}:14.0.1
BuildID: 20120713134347
CrashTime: 1342655269
EMCheckCompatibility: true
Email: [email protected]
FramePoisonBase: 7ffffffff0dea000
FramePoisonSize: 4096
InstallTime: 1342655256
Notes: AdapterVendorID: 0x8086, AdapterDeviceID: 0x2a02GL Context? GL Context+ GL Layers? GL Layers+
ProductID: {ec8030f7-c20a-464f-9b0e-13a3a9e97384}
ProductName: Firefox
ReleaseChannel: release
StartupTime: 1342655256
Theme: classic/1.0
Throttleable: 1
URL: http://www.mozilla.org/en-US/firefox/14.0.1/whatsnew/?oldversion=rv:1.9.2.13
Vendor: Mozilla
Version: 14.0.1
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Using the HTML Validator for Firefox, I have found that every page I open has errors, not just the ones I have designed; why?

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