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Seoquake is a browser extension that allows you to monitor multiple parameters that are important for search engine optimization. It doesn’t do anything extraordinary, but the information is presented pretty well. Google, Yahoo and Live.com indexation, number of pages in each search engine, Alexa Rank and other parameters. It is fully customizable: you may tune almost all features that Seoquake has. Here is how it looks like:

Just try it and I’m sure you’ll find it useful. You may get it here. Plugin is often updated so it will be working even after any SERP changes.