Choose a custom user agent.
## UI
+*scroll_lines*++
+ Type: integer++
+ Default: 3++
+ Number of lines to scroll in the "scroll_lines_\*" keybindings.
+
*tab_width*++
Type: integer++
Default: 20++
Default: o++
Toggle JavaScript.
+*toggle_img*++
+ Type: string++
+ Default: NULL++
+ Toggle image loading.
+
*web_search*++
Type: string++
Default: d++