userChrome.css findbar

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* only needed once */

/* add text to Previous and Next buttons */
.findbar-find-previous label:after { content: "Previous"; }
.findbar-find-next label:after { content: "Next"; }

/* position buttons so Next is before Previous */
.findbar-container>hbox>.findbar-find-previous {-moz-box-ordinal-group:2!important;border-right-width:1px!important;}
.findbar-container>hbox>.findbar-find-next {border-right-width:0px!important;}

/* more possible tweaks */
/* Quick find - show buttons */
.findbar-container>*,.findbar-container>hbox>* { display:-moz-box; }

/* move spacer to a position behind the Match case button */
.findbar-container>spacer { -moz-box-ordinal-group:3 !important; }

/* close button at far left */
.findbar-container>.findbar-closebutton { -moz-box-ordinal-group: 0 !important; margin-right:10px !important; }

/* close button at far right */
/* .findbar-container>.findbar-closebutton { -moz-box-ordinal-group:3 !important; } */

/* adjust the width of the text field */
.findbar-textbox { width:15em !important; }

/* add a background color to the checked Highlight and Case sensitive buttons */
.findbar-highlight[checked]>label { color:#222; background-color:#ff8 !important; }
.findbar-case-sensitive[checked]>label { color:#222; background-color:#f88 !important; }
.findbar-case-sensitive[checked]+label { display:none !important; } /* hide "(Case sensitive)" label */

/* move phrase not found over to the right */
.findbar-container>.findbar-find-status{-moz-box-ordinal-group:2!important;}