+bindsym $mod+equal focus parent
+# move firefox to current workspace.
+# https://i3wm.org/docs/userguide.html#keybindings
+# get class with xprop, example output
+# WM_CLASS(STRING) = "irssi", "URxvt"
+# xprop |& grep WM_CLASS
+bindsym $mod+w [class="abrowser"] move workspace current
+