[First time on Phabricator. I hope this is ok to report this issue here.]
I cannot add the French version of Wikipedia search engine to Firefox (version 60.0.1 in English).
Firefox detects the search engine and proposes to "Add Wikipedia (fr)" to the search engines.
But it fails and returns:
"Invalid Format"
"Firefox could not install the search engine from: https://fr.wikipedia.org/w/opensearch_desc.php"
Steps to reproduce:
Go to fr.wikipedia.org then try to add the search engine.
I deleted my firefox profile and tried again. No luck.
Not sure if this is a Wikipedia or Firefox issue.