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This is the error that is being constantly shown in my Firebug console -

illegal character
Line 1

When I turn off the Show JavaScript Errors from the Firebug console option, it does not report any error.

Why? Is there something wrong with my plugin, or is it really an error?

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What OS? (I no errors here Win7/x64 latest FF & Firebug) – Richard Jul 27 '10 at 8:00
@Richard: My OS is Windows 7 64 bit version – MD Sayem Ahmed Jul 27 '10 at 10:18
Interesting. I thought I got something like this at work today when I browsed to a SO site through Visual Studio. I'll have to try it again tomorrow and see if it's the same problem. – Jon Seigel Nov 24 '10 at 23:38
Well, I forgot about this until now. Unfortunately, I can't reproduce the error I got. – Jon Seigel Nov 29 '10 at 18:19
up vote 2 down vote accepted

In my case it was because of Privoxy treating blocked scripts as images (+handle-as-image or +block-as-image action).

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