The contextual analysis projects at Northwestern's Infolab are a group of projects with a common set of goals and a common architecture. Built on the lab's Architecture for Contextual Analysis, the following browser extension incorporates different approaches to analyzing and presenting data related to the user's current context.
While the Firefox extension appears to be installable via direct link, it should be installed by downloading first. We are seeing different behaviors for these modes of installation, likely due to security policies in Firefox.
The Chrome extension should be downloaded and copied locally into the Extensions window (Window > Extensions).
The Safari exension should be downloaded, unzipped, and installed via the Extension Builder (Develop > Show Extension Builder)