Cool - I use GuerrillaMail to sign up to sites that I know I will never need/want to recover login information for. However, I've always been at a loss for logins such as those for online stores and end up providing my real email. Nice to know that this service provides an alternative.

I've recently started using the browser extension uMatrix for control over the first and third party requests made by a website. Previously, I used RequestPolicy for this, but uMatrix allows for finer grained control, such as blocking/allowing a specific class of request (such as images, css, or javascript) by domain on a site-by-site basis. The inbuilt support to block known bad hosts is also a plus. In the extreme case, you can achieve the functionality that you mentioned by blocking everything by default.

Mail clients like Thunderbird or mutt can be useful for avoid annoyances like this. They also have the benefit of providing a consistent interface, saving the user from unexpected or unwanted changes in the webmail interface.

I barely use Firefox or one of its forks without first installing Adblock Plus, NoScript, RequestPolicy, Cookie Monster, and HTTPS Everywhere. The loss of any of these would make me reconsider updating to a version where these were broken. I have also recently been happy with customizing the Firefox UI with Stylish and with the additional features provided by HackTheWeb and Vimperator. While alternatives may exist in the Chrome world, switching away from Firefox to retain already present functionality seems irritating at best.

In addition to the choices in the poll, I like that it works well without Javascript and cross-site requests. Also, that the focus on HTML based functionality makes it easy to browse in lynx.