Comment 4 for bug 194342

and here is firefox-3.0:

ix:~/bzr/build-area/firefox-3.0-3.0~b4~cvs20080215t1220+nobinonly$ debian/rules compare
## Compare the content of dist/bin and debian/tmp...
-components/browsercompsbase.xpt
-components/browser-feeds.xpt
-components/browserplaces.xpt
-components/browsersearch.xpt
+components/browser.xpt
-components/fuel.xpt
-components/microsummaries.xpt
-components/migration.xpt
-components/safebrowsing.xpt
-components/sessionstore.xpt
-components/shellservice.xpt
-<email address hidden>/platform/OS2/chrome/icons/default/winInspectorMain.ico
-<email address hidden>/platform/WINNT/chrome/icons/default/winInspectorMain.ico
-LICENSE
-nsinstall
+removed-files
## =================================================
## Compare the content of debian/tmp and the debs produced...
-usr/lib/firefox-3.0b4pre/libjemalloc.so
## End of Compare

I'll fix libjemalloc.so in the firefox-3.0.head bzr branch (it's new to beta4).
About the xpt, I'm not sure.