Found out by chance after installing beagle, maybe it should rdepend on firefox 3.0, so that users don't enable it randomly?
+*beagle-0.3.9-r2 (05 Sep 2009) + + 05 Sep 2009; Peter Alfredsen <loki_val@gentoo.org> + -files/beagle-0.2.7-crawltweek.patch, + -files/beagle-0.2.18-mono-1.9.1.patch, + -files/beagle-0.3.7-evo-sharp.patch, -beagle-0.3.9.ebuild, + beagle-0.3.9-r1.ebuild, +beagle-0.3.9-r2.ebuild, + +files/beagle-0.3.9-firefox-3.5.patch: + Backport patch from upstream to fix bug 283740, problems with firefox + extension and >=firefox-3.5 in 0.3.9-r2. Restrict 0.3.9-r1 to older + versions of firefox. Clean out old patches. +