What Do I Have to Do is synth orienated and has multilayered vocals. Much of the synth was omitted and the drums, bass and vocals were toned down for the second album version. The third version, the 7" Mix, contains a newer drum track, multilayered vocals in the chorus and relies much less on the synthesizers on the album version. This version of the song also contains samples from American comedian Sam Kinison, and was used for the music video. Originally, "What Do I Have To Do" was planned to be released as the follow-up single to "Better the Devil You Know", but was later released
Add-on (Mozilla) made to install the add-on on a version outside of this range, it will install but will be disabled. The success of a formal compatibility check is no guarantee the add-on will work, however. It is even possible to override the compatibility check using various extensions. The add-ons manager periodically checks for updates for extensions installed from the Mozilla Add-ons website, although checks for updates can be manually initiated by the user. If the developer includes provisions to check elsewhere, the add-ons manager will do so. Firefox 57 ("Quantum") ceases support for extensions based on XUL or the Add-ons SDK,