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Cardtainers is a Firefox extension designed to simplify the management of containers specfically for NationStates.

Instead of manually generating container rules every time you create a new puppet, Cardtainers automates this process. It allows you to input a list of puppet names into a textarea when you click the extension icon. The extension then matches the URLs for /nation= and /container= for each nation, either creating a new container or using an existing one to open the tab.

Use Cardtainers if you want to avoid the hassle of generating container rules repeatedly, especially if you’re frequently creating new nations.

Get it here

Differences

With Cardtainers, you no longer need to manually generate container rules. Simply paste a list of your puppets into the textarea under the extension toolbar button, formatted like:

kazakhstan
norway
puppet farmer1

Cardtainers will handle the rest, making your workflow more efficient and less tedious.