diff --git a/config/awesome/rc.lua b/config/awesome/rc.lua
index aaac335..884d5f7 100644
--- a/config/awesome/rc.lua
+++ b/config/awesome/rc.lua
@@ -544,6 +544,9 @@ awful.rules.rules = {
   -- { rule = { class = "Firefox" },
   --   properties = { screen = 1, tag = "2" } },
 
+  -- Prevent Fireox from automaticaly being maximised when opened.
+  { rule = { class = "firefox" }, properties = { opacity = 1, maximized = false, floating = false } },
+
   { rule = { class = "mpv" }, properties = { tag = "5", fullscreen = true } },
 
   { rule = { name = "Podcasts - Pocket Casts" }, properties = { tag = "6" } },