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Quero Toolbar
[x64] Windows 8 | 7 | Vista
Version 8 English (754 KB)
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source code
After downloading the installer, close all open instances of Internet Explorer.
Tip: You can update to newer versions without uninstalling Quero Toolbar before.
System Requirements
Microsoft Windows 98 or later
Microsoft Internet Explorer 5.5 or later
(IE11 and 64-bit IE supported)
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Links
I have posted a tutorial in the forum how to add the W3C validator and a PageRank query to Quero.