Just who is looking over your shoulder when you browse the Internet? Tomorrow, web users will be given a new tool to shine a light on the commercial organisations which track your every movement online.

Lightbeam, a download produced by Mozilla, the US free software community behind the popular Firefox browser, claims to be a “watershed” moment in the battle for web transparency.

Everyone who browses the Internet leaves a digital trail used by advertisers to discover what your interests are.

Users who activate Lightbeam will be able to see a real-time visualisation of every site they visit and every third-party that is active on those sites, including commercial organisations which might potentially be sharing your data.

Mozilla wants users who install the Lightbeam add-on to Firefox, to crowd-source their data, to produce the first “big picture” view of web tracking, revealing which third-parties are most active.

Lightbeam promises a “Wizard of Oz” moment for the web, “where users collectively provide a way to pull back the curtains to see its inner workings,” Mozilla claimed.

Does that mean everyone who's looking? ;-) To read more, click here.