Added pref to do autocopy by default only on UNIX. Part of fix to 41045. r=mjudge, a=beppe

modules/libpref/src/init/all.js

@@ -497,6 +497,9 @@ pref("security.policy.default.window.scriptglobals", "sameOrigin");
 pref("middlemouse.paste", false);
 pref("middlemouse.openNewWindow", false);
 
+// Clipboard behavior
+pref("clipboard.autocopy", false);
+
 /* 0=lines, 1=pages, 2=history , 3=text size */
 pref("mousewheel.withnokey.action",0);
 pref("mousewheel.withnokey.numlines",1);	

modules/libpref/src/unix/unix.js

@@ -51,6 +51,9 @@ pref("middlemouse.paste", true);
 pref("middlemouse.openNewWindow", true);
 pref("middlemouse.scrollbarPosition", true);
 
+// Clipboard behavior
+pref("clipboard.autocopy", true);
+
 // Instead of "delay_images"
 pref("browser.autoload_images", true);