diff --git a/background/update-manager.js b/background/update-manager.js
index d2c5dd53..22cf0316 100644
--- a/background/update-manager.js
+++ b/background/update-manager.js
@@ -115,7 +115,7 @@ const updateMan = (() => {
     } = opts;
     if (!id) id = style.id;
     const {md5Url} = style;
-    let ucd = style.usercssData;
+    let {usercssData: ucd, updateUrl} = style;
     let res, state;
     try {
       await checkIfEdited();
@@ -151,9 +151,11 @@ const updateMan = (() => {
       if (md5 === style.originalMd5 && style.originalDigest && !ignoreDigest) {
         return Promise.reject(STATES.SAME_MD5);
       }
+      let varsUrl = '';
       if (!ucd) {
-        ucd = true;
-        style.updateUrl = `${URLS.uso}api/v1/styles/${md5Url.match(/\/(\d+)/)[1]}`;
+        ucd = {};
+        varsUrl = updateUrl;
+        updateUrl = style.updateUrl = `${URLS.uso}api/v1/styles/${md5Url.match(/\/(\d+)/)[1]}`;
       }
       usoSpooferStart();
       let json;
@@ -161,6 +163,7 @@ const updateMan = (() => {
         json = await tryDownload(style.updateUrl, {responseType: 'json'});
         json = await updateUsercss(json.css) ||
           (await API.uso.toUsercss(json)).style;
+        if (varsUrl) await API.uso.useVarsUrl(json, varsUrl);
       } finally {
         usoSpooferStop();
       }
diff --git a/background/uso-api.js b/background/uso-api.js
index 2276d275..ad30347c 100644
--- a/background/uso-api.js
+++ b/background/uso-api.js
@@ -2,18 +2,31 @@
 /* global usercssMan */
 'use strict';
 
-/* exported usoApi */
-const usoApi = {
+const usoApi = {};
+
+(() => {
+  const pingers = {};
+
+  usoApi.pingback = (usoId, delay) => {
+    clearTimeout(pingers[usoId]);
+    delete pingers[usoId];
+    if (delay > 0) {
+      return new Promise(resolve => (pingers[usoId] = setTimeout(ping, delay, usoId, resolve)));
+    } else if (delay !== false) {
+      return ping(usoId);
+    }
+  };
+
   /**
    * Replicating USO-Archive format
    * https://github.com/33kk/uso-archive/blob/flomaster/lib/uso.js
    * https://github.com/33kk/uso-archive/blob/flomaster/lib/converters.js
    */
-  async toUsercss(data, {metaOnly = true} = {}) {
+  usoApi.toUsercss = async (data, {metaOnly = true, varsUrl} = {}) => {
     const badKeys = {};
     const newKeys = [];
     const descr = JSON.stringify(data.description.trim());
-    const vars = (data.style_settings || []).map(makeVar).join('');
+    const vars = (data.style_settings || []).map(makeVar, {badKeys, newKeys}).join('');
     const sourceCode = `\
 /* ==UserStyle==
 @name         ${data.name}
@@ -23,102 +36,122 @@ const usoApi = {
 @author       ${(data.user || {}).name || '?'}
 @license      ${makeLicense(data.license)}${vars ? '\n@preprocessor uso' + vars : ''}`
       .replace(/\*\//g, '*\\/') +
-      `==/UserStyle== */\n${newKeys[0] ? useNewKeys(data.css) : data.css}`;
-    const res = await usercssMan.build({sourceCode, metaOnly});
-    return Object.assign(res, {badKeys, newKeys});
+      `==/UserStyle== */\n${newKeys[0] ? useNewKeys(data.css, badKeys) : data.css}`;
+    const {style} = await usercssMan.build({sourceCode, metaOnly});
+    usoApi.useVarsUrl(style, varsUrl);
+    return {style, badKeys, newKeys};
+  };
 
-    function makeLicense(s) {
-      return !s ? 'NO-REDISTRIBUTION' :
-        s === 'publicdomain' ? 'CC0-1.0' :
-          s.startsWith('ccby') ? `${s.toUpperCase().match(/(..)/g).join('-')}-4.0` :
-            s;
+  usoApi.useVarsUrl = (style, url) => {
+    if (!/\?ik-/.test(url)) {
+      return;
     }
-
-    function makeVar({
-      label,
-      setting_type: type,
-      install_key: ik,
-      style_setting_options: opts,
-    }) {
-      let value, suffix;
-      ik = makeKey(ik);
-      label = JSON.stringify(label);
-      switch (type) {
-
-        case 'color':
-          value = opts[0].value;
-          break;
-
-        case 'text':
-          value = JSON.stringify(opts[0].value);
-          break;
-
-        case 'image': {
-          const ikCust = `${ik}-custom`;
-          opts.push({
-            label: 'Custom',
-            install_key: `${ikCust}-dropdown`,
-            value: `/*[[${ikCust}]]*/`,
-          });
-          suffix = `\n@advanced text ${ikCust} ${label.slice(0, -1)} (Custom)" "https://foo.com/123.jpg"`;
-          type = 'dropdown';
-        } // fallthrough
-
-        case 'dropdown':
-          value = '';
-          for (const o of opts) {
-            const def = o.default ? '*' : '';
-            const val = o.value;
-            const s = `  ${makeKey(o.install_key)} ${JSON.stringify(o.label + def)} <<<EOT${
-              val.includes('\n') ? '\n' : ' '}${val} EOT;\n`;
-            value = def ? s + value : value + s;
-          }
-          value = `{\n${value}}`;
-          break;
-
-        default:
-          value = '"ERROR: unknown type"';
-      }
-      return `\n@advanced ${type} ${ik} ${label} ${value}${suffix || ''}`;
+    const cfg = {badKeys: {}, newKeys: []};
+    const {vars} = style.usercssData;
+    if (!vars) {
+      return;
     }
-
-    function makeKey(key) {
-      let res = badKeys[key];
-      if (!res) {
-        res = key.replace(/[^-\w]/g, '-');
-        res += newKeys.includes(res) ? '-' : '';
-        if (key !== res) {
-          badKeys[key] = res;
-          newKeys.push(res);
+    for (let [key, val] of new URLSearchParams(url.split('?')[1])) {
+      if (!key.startsWith('ik-')) continue;
+      key = makeKey(key.slice(3), cfg);
+      const v = vars[key];
+      if (!v) continue;
+      if (v.options) {
+        let sel = val.startsWith('ik-') && optByName(v, makeKey(val.slice(3), cfg));
+        if (!sel) {
+          key += '-custom';
+          sel = optByName(v, key + '-dropdown');
+          if (sel) vars[key].value = val;
         }
+        if (sel) v.value = sel.name;
+      } else {
+        v.value = val;
       }
-      return res;
-    }
-
-    function useNewKeys(css) {
-      const rxsKeys = stringAsRegExp(Object.keys(badKeys).join('\n'), '', true).replace(/\n/g, '|');
-      const rxUsoVars = new RegExp(`(/\\*\\[\\[)(${rxsKeys})(?=]]\\*/)`, 'g');
-      return css.replace(rxUsoVars, (s, a, key) => a + badKeys[key]);
-    }
-  },
-};
-
-(() => {
-  const timers = {};
-
-  usoApi.pingback = (usoId, delay) => {
-    clearTimeout(timers[usoId]);
-    delete timers[usoId];
-    if (delay > 0) {
-      return new Promise(resolve => {
-        timers[usoId] = setTimeout(ping, delay, usoId, resolve);
-      });
-    } else if (delay !== false) {
-      return ping(usoId);
     }
+    return true;
   };
 
   function ping(id, resolve) {
-    return fetch(`${URLS.uso}styles/install/${id}?source=stylish-ch`).then(resolve);
+    return fetch(`${URLS.uso}styles/install/${id}?source=stylish-ch`)
+      .then(resolve);
+  }
+
+  function makeKey(key, {badKeys, newKeys}) {
+    let res = badKeys[key];
+    if (!res) {
+      res = key.replace(/[^-\w]/g, '-');
+      res += newKeys.includes(res) ? '-' : '';
+      if (key !== res) {
+        badKeys[key] = res;
+        newKeys.push(res);
+      }
+    }
+    return res;
+  }
+
+  function makeLicense(s) {
+    return !s ? 'NO-REDISTRIBUTION' :
+      s === 'publicdomain' ? 'CC0-1.0' :
+        s.startsWith('ccby') ? `${s.toUpperCase().match(/(..)/g).join('-')}-4.0` :
+          s;
+  }
+
+  function makeVar({
+    label,
+    setting_type: type,
+    install_key: ik,
+    style_setting_options: opts,
+  }) {
+    const cfg = this;
+    let value, suffix;
+    ik = makeKey(ik, cfg);
+    label = JSON.stringify(label);
+    switch (type) {
+
+      case 'color':
+        value = opts[0].value;
+        break;
+
+      case 'text':
+        value = JSON.stringify(opts[0].value);
+        break;
+
+      case 'image': {
+        const ikCust = `${ik}-custom`;
+        opts.push({
+          label: 'Custom',
+          install_key: `${ikCust}-dropdown`,
+          value: `/*[[${ikCust}]]*/`,
+        });
+        suffix = `\n@advanced text ${ikCust} ${label.slice(0, -1)} (Custom)" "https://foo.com/123.jpg"`;
+        type = 'dropdown';
+      } // fallthrough
+
+      case 'dropdown':
+        value = '';
+        for (const o of opts) {
+          const def = o.default ? '*' : '';
+          const val = o.value;
+          const s = `  ${makeKey(o.install_key, cfg)} ${JSON.stringify(o.label + def)} <<<EOT${
+            val.includes('\n') ? '\n' : ' '}${val} EOT;\n`;
+          value = def ? s + value : value + s;
+        }
+        value = `{\n${value}}`;
+        break;
+
+      default:
+        value = '"ERROR: unknown type"';
+    }
+    return `\n@advanced ${type} ${ik} ${label} ${value}${suffix || ''}`;
+  }
+
+  function optByName(v, name) {
+    return v.options.find(o => o.name === name);
+  }
+
+  function useNewKeys(css, badKeys) {
+    const rxsKeys = stringAsRegExp(Object.keys(badKeys).join('\n'), '', true).replace(/\n/g, '|');
+    const rxUsoVars = new RegExp(`(/\\*\\[\\[)(${rxsKeys})(?=]]\\*/)`, 'g');
+    return css.replace(rxUsoVars, (s, a, key) => a + badKeys[key]);
   }
 })();
diff --git a/content/install-hook-userstyles.js b/content/install-hook-userstyles.js
index c7724b41..786e7ce4 100644
--- a/content/install-hook-userstyles.js
+++ b/content/install-hook-userstyles.js
@@ -108,7 +108,7 @@
 
   async function buildStyle() {
     if (!pageData) pageData = await (await fetch(apiUrl)).json();
-    ({style, badKeys} = await API.uso.toUsercss(pageData));
+    ({style, badKeys} = await API.uso.toUsercss(pageData, {varsUrl: dup.updateUrl}));
     Object.assign(style, {
       md5Url,
       id: dup.id,