component/firefox: compatibility for testnodes running too old erp5.util

Turned out we are not ready to apply the part about storing wrappers in
${bin:directory} from "Firefox: install wrappers in
${buildout:bin-directory} and version up"

This commit is to be reverted once we update test nodes to 1.0.73 or
higher

component/firefox/buildout.cfg

@@ -171,3 +171,15 @@ script =
   url, md5sum = self.options[guessPlatform()].split()
   extract_dir = self.extract(self.download(url, md5sum))
   shutil.copy(extract_dir + '/geckodriver', %(location)r)
+
+
+### BBB
+# testnodes are still using erp5-util.0.4.50 and are not looking for firefox in path
+# To be removed once testnode are updated to
+# https://lab.node.vifib.com/nexedi/slapos/raw/1.0.73/software/erp5testnode/software.cfg
+# or later
+[firefox-wrapper]
+location = ${firefox:location}/firefox-slapos
+
+[geckodriver]
+location = ${firefox:location}/geckodriver