bootstrap.js

function uninstall() {
    Components.utils.reportError("uninstall!");
}
function startup() {
    Components.utils.reportError("startup!");
}

function shutdown() {
    Components.utils.reportError("shutdown!");
}

install.rdf

<?xml version="1.0"?>
<RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:em="http://www.mozilla.org/2004/em-rdf#">
  <Description about="urn:mozilla:install-manifest">
    <em:id>test@test</em:id>
    <em:name>boostrap-test</em:name>
    <em:version>9</em:version>
    <em:creator>Nils Maier</em:creator>

    <em:bootstrap>true</em:bootstrap>
    <em:type>2</em:type>

    <!-- Firefox -->
    <em:targetApplication>
      <Description>
        <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
        <em:minVersion>10.0</em:minVersion>
        <em:maxVersion>21.*</em:maxVersion>
      </Description>
    </em:targetApplication>
  </Description>
</RDF>

The install.rdf is just a copy/paste job... The min/maxVersions are a relict of that. :p