diff --git a/common/content/autocommands.js b/common/content/autocommands.js
index 37175aca..73cdd20c 100644
--- a/common/content/autocommands.js
+++ b/common/content/autocommands.js
@@ -70,11 +70,6 @@ var AutoCmdHive = Class("AutoCmdHive", Contexts.Hive, {
  * @instance autocommands
  */
 var AutoCommands = Module("autocommands", {
-    init: function () {
-        if (!config.haveGecko("26"))
-            delete config.autocommands.DownloadPost; // FIXME
-    },
-
     get activeHives() contexts.allGroups.autocmd.filter(h => h._store.length),
 
     add: deprecated("group.autocmd.add", { get: function add() autocommands.user.bound.add }),
diff --git a/common/content/statusline.js b/common/content/statusline.js
index 9110dda4..20ecf1cd 100644
--- a/common/content/statusline.js
+++ b/common/content/statusline.js
@@ -34,8 +34,7 @@ var StatusLine = Module("statusline", {
                 ]
             });
 
-        if (config.haveGecko("25"))
-            config.tabbrowser.getStatusPanel().hidden = true;
+        config.tabbrowser.getStatusPanel().hidden = true;
 
         if (this.statusBar.localName == "toolbar") {
             styles.system.add("addon-bar", config.styleableChrome, literal(function () /*
diff --git a/common/modules/config.jsm b/common/modules/config.jsm
index 3805023c..5622126c 100644
--- a/common/modules/config.jsm
+++ b/common/modules/config.jsm
@@ -48,9 +48,6 @@ var ConfigBase = Class("ConfigBase", {
      * initialization code. Must call superclass's init function.
      */
     init: function init() {
-        if (!config.haveGecko("26"))
-            this.modules.global = this.modules.global.filter(m => m != "downloads"); // FIXME
-
         this.loadConfig();
 
         util.trapErrors(() => {
diff --git a/common/modules/main.jsm b/common/modules/main.jsm
index 80e64a79..c58789f9 100644
--- a/common/modules/main.jsm
+++ b/common/modules/main.jsm
@@ -111,58 +111,24 @@ var Modules = function Modules(window) {
     const BASES = [BASE, "resource://dactyl-local-content/"];
 
     let proxyCache = {};
-    if (config.haveGecko(29))
-        var proxy = new Proxy(window, {
-            get: function window_get(target, prop) {
-                // `in`, not `hasOwnProperty`, because we want to return
-                // unbound methods in `Object.prototype`
-                if (prop in proxyCache)
-                    return proxyCache[prop];
+    var proxy = new Proxy(window, {
+        get: function window_get(target, prop) {
+            // `in`, not `hasOwnProperty`, because we want to return
+            // unbound methods in `Object.prototype`
+            if (prop in proxyCache)
+                return proxyCache[prop];
 
-                let p = target[prop];
-                if (callable(p))
-                    return proxyCache[prop] = p.bind(target);
+            let p = target[prop];
+            if (callable(p))
+                return proxyCache[prop] = p.bind(target);
 
-                return p;
-            },
+            return p;
+        },
 
-            set: function window_set(target, prop, val) {
-                return target[prop] = val;
-            }
-        });
-    else {
-        // Bug 814892
-        let o = {};
-        // Oh, the brokenness... See bug 793210
-        Object.preventExtensions(o);
-        proxy = new Proxy(o, {
-            get: function window_get(target, prop) {
-                // `in`, not `hasOwnProperty`, because we want to return
-                // unbound methods in `Object.prototype`
-                if (prop in proxyCache)
-                    return proxyCache[prop];
-
-                let p = window[prop];
-                if (callable(p))
-                    return proxyCache[prop] = p.bind(window);
-
-                return p;
-            },
-
-            set: function window_set(target, prop, val) {
-                return window[prop] = val;
-            },
-
-            getOwnPropertyDescriptor: function (target, prop) Object.getOwnPropertyDescriptor(window, prop),
-            getOwnPropertyNames: function (target, prop) Object.getOwnPropertyNames(window),
-            defineProperty: function (target, prop, desc) Object.defineProperty(window, prop, desc),
-            deleteProperty: function (target, prop) { delete window[prop]; },
-            has: function (target, prop) prop in window,
-            hasOwn: function (target, prop) hasOwnProperty(window, prop),
-            enumerate: function (target) (p for (p in window)),
-            iterate: function (target) (p for (p of window))
-        });
-    }
+        set: function window_set(target, prop, val) {
+            return target[prop] = val;
+        }
+    });
 
     var jsmodules = newContext(proxy, false, "Dactyl `jsmodules`");
     jsmodules.NAME = "jsmodules";
diff --git a/pentadactyl/install.rdf b/pentadactyl/install.rdf
index 8c4fcd60..f1bd9863 100644
--- a/pentadactyl/install.rdf
+++ b/pentadactyl/install.rdf
@@ -31,7 +31,7 @@
         <em:targetApplication>
             <Description
                 em:id="{ec8030f7-c20a-464f-9b0e-13a3a9e97384}"
-                em:minVersion="25.0"
+                em:minVersion="31.0"
                 em:maxVersion="33.*"/>
         </em:targetApplication>
     </Description>