> I don't know about "dev edition", but wouldn't be surprised if it isn't kept up-to-date
Dev Edition is kept up to date. If you check Firefox Versioning workflow, you will see that Firefox DevEdition replaced aurora which was the version between nightly and beta. Its kept very up to date, there are daily updates on the Dev Edition channel. Also the Firefox UI is fully customizable, just click the menu icon in the toolbar, choose customize and start replacing things you don't like.
Dev Edition is kept up to date. If you check Firefox Versioning workflow, you will see that Firefox DevEdition replaced aurora which was the version between nightly and beta. Its kept very up to date, there are daily updates on the Dev Edition channel. Also the Firefox UI is fully customizable, just click the menu icon in the toolbar, choose customize and start replacing things you don't like.