As the name suggests, it lets you assign a default page for each container. Similar to how you have a homepage for your browser, you now have one for each container.
The primary use case is the following. When you have a container dedicated to say, YouTube, it makes sense that when you open a new tab in your ‘YouTube Container’ it should go directly to YouTube. Of course you can open other things but the extension provides a convenient default behavior.
A plus is that the extension doesn’t ask for permissions and it’s lightweight. You just do the easy setup of assigning default pages to your containers, then it becomes a natural part of your workflow. Please try and let me know what you think.
Some background info about Firefox containers for those unfamiliar:
Firefox containers allow you to create different environments in your browser. The basic functionality is built in Firefox. There are extensions that makes using them more convenient. For example, the Facebook Container extension [0] isolates Facebook and its subdomains and forces it to open in that container. There’s also the Multi-Account-Containers [1] which gives you more power by managing multiple containers. Unlike Facebook Container, it’s not preset up. You need to create the containers for the websites you need. But it’s nice in that it gives features that can work for all websites, such as directing websites to certain containers. More info about containers [2].
[0] https://news.ycombinator.com/item?id=24849452
[1] https://addons.mozilla.org/en-US/firefox/addon/multi-account...
[2] https://wiki.mozilla.org/Security/Contextual_Identity_Projec...
