Bug 1363417 - Flag DevTools Add-on as multi-processes compatible. r=jryans

MozReview-Commit-ID: 7oNV1WQzPdV

--HG--
extra : rebase_source : ec5654f92e29214a9ddfb6ddfebfd6baf81e3c35

devtools/install.rdf

@@ -16,6 +16,7 @@
                em:creator="Mozilla">
 
     <em:bootstrap>true</em:bootstrap>
+    <em:multiprocessCompatible>true</em:multiprocessCompatible>
     <em:targetApplication>
       <Description>
         <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>