Buying off of Craigslist can be quite a process, and of all the things for sale, the cars and trucks section is one of the most daunting. Unlike digital cameras and random bits of furniture, cars are (usually) expensive and come with an important history both from the owner, and the manufacturer.
That's why browser extension Craigslist Car Research is so useful. It adds an entire layer of data on top of each listing to make it easier to both find out more about the car, and others like it for sale on Craigslist; all without having to leave Craigslist.
The extension works the same for Firefox and Chrome. Users with Greasemonkey installed can also just add it to their list of scripts. Once it's up and running, every car listing on Craigslist gets a few extra pages of data below whatever the poster has provided, including things like:
Car reviews from CarSurvey.org and Edmunds.com
Recall or safety notices
Price estimates from places like Motor Trend, Automotive.com, Kelly Blue Book, and the Canadian Black Book
Other similar listings on Craigslist (with prices)
A quick way to check and see other listings that seller has up on Craigslist.
All of this information can be hidden, either all at once or by specific feature. The extension also scans each list for problem words or phrases, and will tip you off on whether it's worth following up with the owner to see if it's been in an accident.
Along with this extension, developer Tech4Computer has another script that can figure out the price of importing a car from the U.S. into Canada. There's also a version of the car and truck shopping extension for motorcycle buyers.