Something I found that might help:
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I called tech support. The easy web print will not install on Mozilla.
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Had a similar query and found the following solution on a newsgroup.
You can find the "plug in" at:-
https://addons.mozilla.org/extensions/?application=firefoxand is called "IEVIEW". When installed, you can left click on a vacant part of the web page and a menu item will come up with "view this page in IE" and from there you can still use the canon web print.
Easy Web Print For Firefox?One other thing that might be of interest:
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If you installed "Cumulative Update for Internet Explorer for Windows XP (KB912812)", which was included in Windows Update for Windows XP SP2, a script error may occur when you print or preview pages using Canon Easy-WebPrint.
Download Fix Now Available for Windows XP Users