diff --git a/.eslintignore b/.eslintignore
index d9b7ef48..d067a75d 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -2,5 +2,6 @@ dist
 assets
 firefox
 coverage
+android/app/build
 app/locale.js
 app/capabilities.js
\ No newline at end of file
diff --git a/.eslintrc.yml b/.eslintrc.yml
index 026ab20e..05c84c01 100644
--- a/.eslintrc.yml
+++ b/.eslintrc.yml
@@ -4,6 +4,7 @@ env:
 
 extends:
   - eslint:recommended
+  - prettier
   - plugin:node/recommended
   - plugin:security/recommended
 
@@ -22,13 +23,5 @@ rules:
   security/detect-non-literal-fs-filename: off
   security/detect-object-injection: off
 
-  eol-last: [error, always]
-  eqeqeq: error
-  no-alert: warn
-  no-console: warn
-  no-path-concat: error
   no-unused-vars: [error, {argsIgnorePattern: "^_|err|event|next|reject"}]
-  no-var: error
-  one-var: [error, never]
-  prefer-const: error
-  quotes: [error, single, {avoidEscape: true}]
+  require-atomic-updates: warn
diff --git a/app/api.js b/app/api.js
index ccc7854e..29237c05 100644
--- a/app/api.js
+++ b/app/api.js
@@ -312,12 +312,13 @@ export function downloadStream(id, keychain) {
 
 //////////////////
 
-function download(id, keychain, onprogress, canceller) {
+async function download(id, keychain, onprogress, canceller) {
+  const auth = await keychain.authHeader();
   const xhr = new XMLHttpRequest();
   canceller.oncancel = function() {
     xhr.abort();
   };
-  return new Promise(async function(resolve, reject) {
+  return new Promise(function(resolve, reject) {
     xhr.addEventListener('loadend', function() {
       canceller.oncancel = function() {};
       const authHeader = xhr.getResponseHeader('WWW-Authenticate');
@@ -337,7 +338,6 @@ function download(id, keychain, onprogress, canceller) {
         onprogress(event.loaded);
       }
     });
-    const auth = await keychain.authHeader();
     xhr.open('get', getApiUrl(`/api/download/blob/${id}`));
     xhr.setRequestHeader('Authorization', auth);
     xhr.responseType = 'blob';
diff --git a/app/streams.js b/app/streams.js
index 73d15097..00159a24 100644
--- a/app/streams.js
+++ b/app/streams.js
@@ -1,4 +1,4 @@
-/* global ReadableStream TransformStream */
+/* global TransformStream */
 
 export function transformStream(readable, transformer, oncancel) {
   try {
diff --git a/package-lock.json b/package-lock.json
index 55213a14..7f1df94f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5591,6 +5591,23 @@
         }
       }
     },
+    "eslint-config-prettier": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/eslint-config-prettier/-/eslint-config-prettier-6.0.0.tgz",
+      "integrity": "sha512-vDrcCFE3+2ixNT5H83g28bO/uYAwibJxerXPj+E7op4qzBCsAV36QfvdAyVOoNxKAH2Os/e01T/2x++V0LPukA==",
+      "dev": true,
+      "requires": {
+        "get-stdin": "^6.0.0"
+      },
+      "dependencies": {
+        "get-stdin": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/get-stdin/-/get-stdin-6.0.0.tgz",
+          "integrity": "sha512-jp4tHawyV7+fkkSKyvjuLZswblUtz+SQKzSWnBbii16BuZksJlU1wuBYXY75r+duh/llF1ur6oNwi+2ZzjKZ7g==",
+          "dev": true
+        }
+      }
+    },
     "eslint-plugin-es": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/eslint-plugin-es/-/eslint-plugin-es-1.4.0.tgz",
diff --git a/package.json b/package.json
index b6add79c..b54210e1 100644
--- a/package.json
+++ b/package.json
@@ -80,6 +80,7 @@
     "css-mqpacker": "^7.0.0",
     "cssnano": "^4.1.10",
     "eslint": "^6.1.0",
+    "eslint-config-prettier": "^6.0.0",
     "eslint-plugin-mocha": "^6.0.0",
     "eslint-plugin-node": "^9.1.0",
     "eslint-plugin-security": "^1.4.0",
diff --git a/scripts/get-prod-locales.js b/scripts/get-prod-locales.js
index 27c86e26..c6aae630 100755
--- a/scripts/get-prod-locales.js
+++ b/scripts/get-prod-locales.js
@@ -19,8 +19,8 @@ exec(cmd)
     const locales = Object.keys(summary)
       .filter(locale => {
         const loc = summary[locale];
-        const hasMissing = loc.hasOwnProperty('missing');
-        const hasErrors = loc.hasOwnProperty('errors');
+        const hasMissing = Object.prototype.hasOwnProperty.call(loc, 'missing');
+        const hasErrors = Object.prototype.hasOwnProperty.call(loc, 'errors');
         return !hasMissing && !hasErrors;
       })
       .sort();
diff --git a/scripts/lint-locales.js b/scripts/lint-locales.js
index fbcf84ef..db1a29de 100644
--- a/scripts/lint-locales.js
+++ b/scripts/lint-locales.js
@@ -33,7 +33,7 @@ function filterErrors(details) {
     .sort()
     .map(locale => {
       const data = details[locale]
-        .filter(item => item.hasOwnProperty('error'))
+        .filter(item => Object.prototype.hasOwnProperty.call(item, 'error'))
         .map(({ error }) => error);
       return { locale, data };
     })
diff --git a/test/.eslintrc.yml b/test/.eslintrc.yml
index dd9f4ba4..b1f66d58 100644
--- a/test/.eslintrc.yml
+++ b/test/.eslintrc.yml
@@ -19,5 +19,7 @@ rules:
   mocha/no-pending-tests: error
   mocha/no-return-and-callback: warn
   mocha/no-skipped-tests: error
+  mocha/no-setup-in-describe: off
+  mocha/no-hooks-for-single-case: off
 
   no-console: off # ¯\_(ツ)_/¯