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I was looking for some Seo extensions/plugins for my favourite browser, Opera.

This is what I found:

Seo for Opera

Seo for Opera is basically a port of the Seo for Firefox extension to opera. It enhances Google and Yahoo search results by adding additional information to each returned page.

As far as I saw it is not maintained, and sometimes unstable, but it seems to work well.

For detailed Features see Seo for Firefox.

Seobar

Seobar is a Opera userscript that can be used directly on the site in question. It adds an additional layer with information about the site you are viewing.

The information contains:

• Alexa Traffic Rank
• Google Page Rank

• Yandex CY
• DMOZ
• Yahoo! Directory
• Yandex.Directory
• Rambler’s Top100

• Google backlinks/pages
• Yahoo backlinks/pages
• MSN backlinks/pages
• Yandex backlinks/pages

It also adds title/description for some results.

Here is an image of the layer, displaying backlinks: