Updated Advanced use cases (markdown)

Advanced-use-cases.md

@@ -122,6 +122,31 @@ StartupWMClass=NNN
 
 `--class "NNN"` is used to group all `nnn` instances together and `StartupWMClass=NNN` to tell launcher which windows should be associated with this icon.
 
+### Browser Integration
+
+#### Chromium
+
+To use `nnn` as the file picker dialog for chromium browsers, create a script `kdialog` in your path:
+
+```sh
+#!/bin/sh
+while :; do case $1 in
+    --getsavefilename) file="$2" break ;;
+    --*) shift ;;
+    *) break ;;
+esac done
+file="${file##/*/}"
+st -c picker sh -c "nnn -S -s picker -p - | awk '{ print system(\"[ -d \" \$0 \" ]\") ? \$0: \$0\"/${file##/*/}\" }' > /proc/$$/fd/1"
+```
+
+Then create a browser wrapper that launches your browser with `XDG_CURRENT_DESKTOP=KDE`:
+```sh
+#!/bin/sh
+XDG_CURRENT_DESKTOP=KDE <browser binary> "$@"
+```
+
+This will cause chromium to look for `kdialog` to open files, make sure the `kdialog` script comes in your `PATH` before the `kdialog` package binary if you have this installed.
+
 ## Launch `nnn` with a keyboard shortcut
 
 ### On a Desktop Environment (KDE, GNOME, XFCE)