You can use the "Quick Find Link", which is activated using the apostrophe (') key, to select a Label from the sidebar by typing in part or all of the Label name. You can use the F3 key to find the next matching link. Once th Label you wish to select is highlighted, pressing the Enter key activates the link, which will take you to page listing the e-mails which have been tagged with the selected Label.
Gmail natively allows you to do something similar by typing "in:label_name" in the search field (which can be activated by the "/" keyboard shortcut). However there are a couple of differences between this method and the previously mentioned Firefox specific method:
1. You need to type in the *full* Label name after the "in:" search parameter.
2. Gmail only displays 20 e-mails for each "results" page it returns, even if you have set the default value to 100 e-mails per page.
