#add-additional-vertical-container > #add-additional-vertical-box > #add-additional-vertical-bar[orient="vertical"] {
    min-width: 100px !important;
}

/*Findbar - forum.mozilla-russia.org/viewtopic.php?pid=758591#p758591*/
@-moz-document url-prefix("chrome://browser/content/browser.x"){
findbar{
    -moz-box-ordinal-group: 0 !important;
    position: fixed !important;
    right: auto !important;
    left: 20px !important;
    top: auto !important;
    bottom: auto !important;
    margin: -1px 0 0 0 !important;
    padding: 0 !important;
    white-space: nowrap !important;
    max-width: calc(100% - 20px) !important;
    overflow: hidden !important;
    border: 1px solid var(--toolbox-border-bottom-color, rgba(0,0,0,.25)) !important;
    border-top-width: 0 !important;
    box-shadow: none !important;
    visibility: visible !important;
    transition: none !important;
    z-index: 3 !important;
    border-radius: 0 0 6px 6px !important;}

findbar > hbox.findbar-container{
    max-width: calc(100% - 22px) !important;
    overflow: hidden !important;
    margin: 0 !important;
    padding: 0 2px !important;}

findbar > hbox.findbar-container > * {margin: 0 !important;}
findbar > hbox.findbar-container > :-moz-any(toolbarbutton,label,description){margin: 1px !important;}

findbar textbox{
    min-height: 22px !important;
    height: auto !important;
    font-size: 100% !important;}

findbar > .findbar-closebutton{
    margin: 0 !important;
    padding: 3px !important;
    border:none!important;
    -moz-appearance:none!important;}

findbar > .findbar-closebutton > .toolbarbutton-icon{
    margin: 0 !important;
    padding: 0 !important;
    border: none !important;
    height: 16px !important;
    width: 16px !important;}

findbar[hidden="true"],
#main-window[inFullscreen] #navigator-toolbox[style*="margin-top"] ~ #content-deck .browserContainer > findbar{
    visibility:collapse!important;}

#sidebar-box[positionend="true"][ordinal] ~ #appcontent .browserContainer > findbar:-moz-locale-dir(ltr),
findbar:-moz-locale-dir(rtl){right: auto !important;left: 20px !important;}

#sidebar-box[positionend="true"][ordinal] ~ #appcontent .browserContainer > findbar:-moz-locale-dir(rtl){
                             right: 20px !important;left: auto !important;}

findbar > hbox.findbar-container{-moz-box-direction: reverse !important;}

#sidebar-box[positionend="true"][ordinal] ~ #appcontent .browserContainer > findbar > hbox.findbar-container{
    -moz-box-direction: normal !important;}

findbar:not(:-moz-lwtheme){
    background-color: var(--toolbar-bgcolor, -moz-Dialog) !important;
    background-image: var(--toolbar-bgimage, none) !important;
    color: var(--toolbar-color, -moz-DialogText) !important;}

findbar:-moz-lwtheme{
    background-color: transparent !important;
    background-image: linear-gradient(var(--chrome-secondary-background-color, var(--toolbar-bgcolor, -moz-Dialog)), var(--chrome-secondary-background-color, var(--toolbar-bgcolor, -moz-Dialog))), var(--lwt-header-image, none) !important;
    background-repeat: no-repeat, no-repeat !important;
    background-size: auto auto !important;
    background-attachment: scroll, fixed !important;
    background-position: 0% 0%, right top !important;
    color: var(--toolbar-color, var(--lwt-text-color, -moz-DialogText)) !important;
    text-shadow: inherit !important;}

findbar:-moz-lwtheme .findbar-find-status, 
findbar:-moz-lwtheme .found-matches{color:inherit!important;}

findbar > * {vertical-align:middle!important;}

findbar > hbox.findbar-container > .find-status-icon,
findbar .findbar-button> .toolbarbutton-text{display:none!important;}

findbar .findbar-button > .toolbarbutton-icon{
    display: -moz-box !important;
    margin: 0 !important;
    padding: 0 !important;
    border: none !important;
    height: 16px !important;
    width: 16px !important;}

findbar .findbar-button{
    -moz-appearance:none!important;
    padding: 3px 6px !important;
    border:none!important;
    background:none!important;
    box-shadow:none!important;}

findbar .findbar-button:not(:-moz-any([checked="true"],[disabled="true"])):hover{
    border-image-source: url("../vertical_top_bottom_bar/svg/findbar-button-hover.svg") !important;
    border-image-repeat: stretch !important;
    border-image-slice: 1 fill !important;
    border-image-width: 1px !important;}

findbar .findbar-button:not([disabled="true"]):-moz-any([checked="true"],:hover:active){
    border-image-source: url("../vertical_top_bottom_bar/svg/findbar-button-active.svg") !important;
    border-image-repeat: stretch !important;
    border-image-slice: 1 fill !important;
    border-image-width: 1px !important;}

findbar .findbar-highlight{
list-style-image:url("../vertical_top_bottom_bar/svg/findbar-highlight.svg") !important; -moz-image-region:auto!important;}

findbar .findbar-case-sensitive{
list-style-image:url("../vertical_top_bottom_bar/svg/findbar-case-sensitive.svg") !important; -moz-image-region:auto!important;}

findbar .findbar-entire-word{
list-style-image: url("../vertical_top_bottom_bar/svg/findbar-entire-word.svg") !important; -moz-image-region:auto!important;}

:-moz-any(#tabbrowser-tabpanels,tabbrowser#content) findbar > .findbar-container > .find-status-icon{ -moz-binding:url("../vertical_top_bottom_bar/findbar.xml#findbar")!important;
}
}

<?xml version="1.0" encoding="UTF-8"?>
<bindings
  xmlns="http://www.mozilla.org/xbl"
  xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
  xmlns:xbl="http://www.mozilla.org/xbl">
    <binding id="findbar">
        <implementation>
            <field name="findbar">null;</field>
            <field name="browserContainer">null;</field>
            <field name="addListener">false;</field>
            <field name="timer">null;</field>
            <constructor><![CDATA[
                this.delay = 3000; // Задержка скрытия
                var findbar = this.findbar = this.parentNode.parentNode;
                var browserContainer = this.browserContainer = findbar.parentNode;
                findbar.addEventListener("findbaropen", this, false);
                if (window.gFindBarInitialized && !findbar.hidden && !this.addListener) {
                    this.addListener = true;
                    browserContainer.addEventListener("mousedown", this, false);
                }
                if ("_FindBar_Close_KeyCode" in window) return;
                Object.defineProperty(window, "_FindBar_Close_KeyCode", {
                    value: {
                        init: function() {
                            window.addEventListener("keydown", this, true);
                            window.addEventListener("unload", this, false);
                        },
                        handleEvent: function(event) {
                            if (event.type == "keydown" && event.ctrlKey && event.keyCode == 70 && window.gFindBarInitialized && !gFindBar.hidden && !event.altKey && !event.shiftKey) {
                                event.preventDefault();
                                gFindBar.close();
                            } else if (event.type == "unload") {
                                window.removeEventListener("unload", this, false);
                                window.removeEventListener("keydown", this, true);
                            }
                        }
                    },
                    writable: false,
                    configurable: true,
                    enumerable: false
                });
                window._FindBar_Close_KeyCode.init();
            ]]></constructor>
            <destructor><![CDATA[
                this.findbar.removeEventListener("findbaropen", this, false);
                if (this.addListener)
                    this.browserContainer.removeEventListener("mousedown", this, false);
            ]]></destructor>
            <method name="handleEvent">
                <parameter name="event"/>
                <body><![CDATA[
                    if (event.type == "mousedown") {
                        if (event.target !== this.findbar) {
                            clearTimeout(this.timer);
                            this.timer = setTimeout(() => {
                                if (!this.findbar.hidden)
                                    this.findbar.close();
                                if (this.addListener) {
                                    this.browserContainer.removeEventListener("mousedown", this, false);
                                    this.addListener = false;
                                }
                            }, this.delay);
                        } else
                            clearTimeout(this.timer);
                    } else if (event.type == "findbaropen" && !this.addListener) {
                        this.addListener = true;
                        this.browserContainer.addEventListener("mousedown", this, false);
                    }
                ]]></body>
            </method>
        </implementation>
    </binding>
</bindings>

.css-tabs {
    display: none !important;
}

div.prefs-button {
  display: none !important;
}

checkbox[label^="\42f  \445\43e\447\443  \43f\43e\436\430\43b\43e\432\430\442\44c\441\44f  \43d\430  \44d\442\43e  \440\430\441\448\438\440\435\43d\438\435"] {
    display: none !important;
}

Services.prompt.confirmEx(
    null, "confirmEx", "Купите мне чёрные слепые очки", 1,
    null, null, null, "Игнорировать чудилу", {value: true}
);