diff --git a/.gitignore b/.gitignore
index 7b35ef1..de7638c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ core
 log.txt
 package-lock.json
 gen/
+test_tmp/
diff --git a/.npmignore b/.npmignore
index 7ab2ef2..7abd979 100644
--- a/.npmignore
+++ b/.npmignore
@@ -6,3 +6,4 @@
 package-lock.json
 gen/
 scripts/
+test_tmp/
diff --git a/.travis.yml b/.travis.yml
index 0b84ddb..c37f442 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,5 @@
 language: node_js
+sudo:            required
 os:
   - linux
 node_js:
diff --git a/config/karma.conf.js b/config/karma.conf.js
index 8de339b..cbe6237 100644
--- a/config/karma.conf.js
+++ b/config/karma.conf.js
@@ -2,41 +2,64 @@ const configuration = {
     basePath: '',
     frameworks: [
         'mocha',
-        'browserify'
+        'browserify',
+        'detectBrowsers'
     ],
     files: [
-        '../test/unit.test.js',
-        '../test/issues.test.js',
-        '../test/performance.test.js'
+        '../test_tmp/karma.test.js'
     ],
     port: 9876,
     colors: true,
     autoWatch: false,
 
+    /**
+     * see
+     * @link https://github.com/litixsoft/karma-detect-browsers
+     */
+    detectBrowsers: {
+        enabled: true,
+        usePhantomJS: false,
+        postDetection: function(availableBrowser) {
+            return ['Firefox']; // comment in to test specific browser
+            const browsers = availableBrowser
+                .filter(b => !['PhantomJS', 'FirefoxAurora', 'FirefoxNightly'].includes(b))
+                .map(b => {
+                    if (b === 'Chrome') return 'Chrome_travis_ci';
+                    else return b;
+                });
+            return browsers;
+        }
+    },
+
     // Karma plugins loaded
     plugins: [
         'karma-mocha',
         'karma-browserify',
-        'karma-chrome-launcher'
+        'karma-chrome-launcher',
+        'karma-edge-launcher',
+        'karma-firefox-launcher',
+        'karma-ie-launcher',
+        'karma-opera-launcher',
+        'karma-detect-browsers'
     ],
 
     // Source files that you wanna generate coverage for.
     // Do not include tests or libraries (these files will be instrumented by Istanbul)
     preprocessors: {
-        '../test/*.test.js': ['browserify']
+        '../test_tmp/*.test.js': ['browserify']
     },
 
     client: {
         mocha: {
             bail: true,
-            timeout: 6000
+            timeout: 12000
         }
     },
-    browsers: ['ChromeNoSandbox'],
-    browserDisconnectTimeout: 6000,
-    processKillTimeout: 6000,
+    browsers: ['Chrome_travis_ci'],
+    browserDisconnectTimeout: 12000,
+    processKillTimeout: 12000,
     customLaunchers: {
-        ChromeNoSandbox: {
+        Chrome_travis_ci: {
             base: 'Chrome',
             flags: ['--no-sandbox']
         }
@@ -45,12 +68,12 @@ const configuration = {
 };
 
 if (process.env.TRAVIS) {
-
+    configuration.browsers = ['Chrome_travis_ci'];
     /**
      * overwrite reporters-default
      * So no big list will be shown at log
      */
-    // configuration.reporters = [];
+    configuration.reporters = [];
 }
 
 module.exports = function(config) {
diff --git a/package.json b/package.json
index 53356dc..bea5631 100644
--- a/package.json
+++ b/package.json
@@ -25,11 +25,12 @@
     "test:node": "npm run build && mocha ./test/index.test.js -b --timeout 6000 --exit",
     "test:browser": "npm run build && karma start ./config/karma.conf.js --single-run",
     "lint": "eslint --ignore-path ./config/.eslintignore src test config scripts && solhint \"contracts/**/*.sol\"",
-    "clear": "rimraf -rf ./dist && rimraf -rf ./gen",
+    "clear": "rimraf -rf ./dist && rimraf -rf ./gen && rimraf -rf ./test_tmp",
     "build:sol": "solidity-cli -i './contracts/*.sol' -o ./gen",
     "build:es6": "rimraf -rf dist/es && cross-env NODE_ENV=es6 babel src --out-dir dist/es",
     "build:es5": "cross-env NODE_ENV=es5 node node_modules/babel-cli/bin/babel.js src --out-dir dist/lib",
-    "build": "npm run clear && concurrently \"npm run build:es6\" \"npm run build:es5\" \"npm run build:sol\""
+    "build:test": "cross-env NODE_ENV=es5 node node_modules/babel-cli/bin/babel.js test --out-dir test_tmp",
+    "build": "npm run clear && concurrently \"npm run build:es6\" \"npm run build:es5\" \"npm run build:test\" \"npm run build:sol\""
   },
   "repository": {
     "type": "git",
@@ -43,7 +44,7 @@
   "homepage": "https://github.com/pubkey/eth-crypto#readme",
   "devDependencies": {
     "assert": "1.4.1",
-    "async-test-util": "1.5.1",
+    "async-test-util": "1.6.1",
     "babel-cli": "6.26.0",
     "babel-core": "6.26.3",
     "babel-eslint": "8.2.3",
@@ -70,15 +71,22 @@
     "cross-env": "5.1.6",
     "eslint": "4.19.1",
     "ganache-cli": "6.1.0",
+    "is-node": "1.0.2",
     "js-sha3": "0.7.0",
     "karma": "2.0.2",
     "karma-babel-preprocessor": "7.0.0",
     "karma-browserify": "5.2.0",
     "karma-chrome-launcher": "2.2.0",
     "karma-coverage": "1.1.2",
+    "karma-detect-browsers": "2.3.2",
+    "karma-edge-launcher": "0.4.2",
+    "karma-firefox-launcher": "1.1.0",
+    "karma-ie-launcher": "1.0.0",
     "karma-mocha": "1.3.0",
+    "karma-opera-launcher": "1.0.0",
+    "karma-safari-launcher": "1.0.0",
     "mocha": "5.2.0",
-    "node": "10.1.0",
+    "node": "10.3.0",
     "rimraf": "2.6.2",
     "solhint": "1.2.1",
     "solidity-cli": "1.0.1",
diff --git a/test/issues.test.js b/test/issues.test.js
index 1bf0e2f..a78155f 100644
--- a/test/issues.test.js
+++ b/test/issues.test.js
@@ -44,13 +44,4 @@ describe('issues.test.js', () => {
         );
         assert.ok(signer);
     });
-    it('#6 web3 should not set window.Web3', () => {
-        if (typeof window !== 'undefined' && window){
-            const web3 = EthCrypto.util.web3;
-            assert.ok(web3);
-
-            assert.deepEqual(window.Web3, undefined);
-        }
-    });
-
 });
diff --git a/test/karma.test.js b/test/karma.test.js
new file mode 100644
index 0000000..929968c
--- /dev/null
+++ b/test/karma.test.js
@@ -0,0 +1,3 @@
+require('./unit.test');
+require('./issues.test');
+require('./performance.test');
diff --git a/test/performance.test.js b/test/performance.test.js
index 4f3ae36..5a75a44 100644
--- a/test/performance.test.js
+++ b/test/performance.test.js
@@ -1,6 +1,4 @@
-const convertHrtime = require('convert-hrtime');
 const AsyncTestUtil = require('async-test-util');
-
 const EthCrypto = require('../dist/lib/index');
 
 const benchmark = {
@@ -11,19 +9,11 @@ const benchmark = {
 };
 
 const nowTime = () => {
-    try {
-        return process.hrtime();
-    } catch (err) {
-        return performance.now();
-    }
+    return AsyncTestUtil.performanceNow();
 };
 
 const elapsedTime = before => {
-    try {
-        return convertHrtime(process.hrtime(before)).milliseconds;
-    } catch (err) {
-        return performance.now() - before;
-    }
+    return AsyncTestUtil.performanceNow() - before;
 };
 
 describe('performance.test.js', () => {