Index: gc_lang/fr/webext/manifest.json
==================================================================
--- gc_lang/fr/webext/manifest.json
+++ gc_lang/fr/webext/manifest.json
@@ -5,11 +5,11 @@
   "version": "1.0",
 
   "applications": {
     "gecko": {
       "id": "French-GC@grammalecte.net",
-      "strict_min_version": "56.0"
+      "strict_min_version": "57.0"
     }
   },
 
   "minimum_chrome_version": "61",
 
@@ -137,10 +137,9 @@
     "search_provider": {
       "name": "Grammalecte",
       "search_url": "https://grammalecte.net/dictionary.php?prj=fr&lemma={searchTerms}",
       "keyword": "gram",
       "favicon_url": "https://grammalecte.net/favicon.ico",
-      "encoding": "UTF-8",
       "is_default": false
     }
   }
 }