diff --git a/README.md b/README.md
index 714eaaf..6d80fff 100644
--- a/README.md
+++ b/README.md
@@ -4,13 +4,13 @@ This is a **Chrome and Firefox Extension** that allows you to open threads in Gi
 
 ## Features
 
-### Mail View Shortcut
+#### Mail View Shortcut
 
 Open your GitHub notifications using a shortcut (default to `shift + g`, or `shift + b` to open in the background in Chrome), or this button in mail view:
 
 ![image](https://f.cloud.github.com/assets/1153134/1699454/20634378-5f9f-11e3-999c-c0c5e3e96684.png)
 
-### List View Shortcut
+#### List View Shortcut
 
 The shortcut is `ctrl + return(enter)`, currently non-customisable. It will trigger one of these two when an email is selected using key navigation(when the blue bar appears):
 
@@ -19,25 +19,26 @@ The shortcut is `ctrl + return(enter)`, currently non-customisable. It will trig
 
 The function will only look for a label if there is no action buttons.
 
-#### Action button
+##### Action button
 
 ![action button in list view](https://cloud.githubusercontent.com/assets/1153134/4344159/52248e7c-407b-11e4-9c80-fdc9f8a9f8cc.png)
 
-#### Label
+##### Label
 
 ![label in list view](https://f.cloud.github.com/assets/1153134/2073597/f19b6232-8d61-11e3-8e65-b03db4e72217.png)
 
 ## Installation
 
-### The Easy Way
+#### The Easy Way
 
-[Install the extension via Chrome webstore](https://chrome.google.com/webstore/detail/github-notification-helpe/gmhijkhbpihfmkmhmcfebmlkaekgmaje)
+[Install the extension via Chrome webstore](https://chrome.google.com/webstore/detail/github-notification-helpe/gmhijkhbpihfmkmhmcfebmlkaekgmaje) or [Install the addon via Firefox addons gallery](https://addons.mozilla.org/en-US/firefox/addon/github-for-gmail/)
 
-### The Mu-An-might-steal-all-my-data-so-I-want-to-manually-load-it Way
+#### The Mu-An-might-steal-all-my-data-so-I-want-to-manually-load-it Way (for Chrome)
 
 1. Go to [Releases](https://github.com/muan/github-gmail/releases) and download the latest version.
 2. Unzip the folder wherever you'd like.
-3. Go to Chrome extensions page (`chrome://extensions/`) and load the folder as an **Unpacked extension**.
+3. Read Mu-An's code making sure there is no data stealing.
+4. Go to Chrome extensions page (`chrome://extensions/`) and load the folder as an **Unpacked extension**.
 
 As:
 
@@ -45,35 +46,33 @@ As:
 
 ## Options and preferences
 
-![](https://f.cloud.github.com/assets/1153134/1715451/2fcb1c8a-61b3-11e3-9960-1f3ef6a48f48.png)
-
 There are 3 preference settings:
 
 1. Custom domains
 2. Mail view shortcut
 3. List view regular expression
 
-**Attention** After updating a setting, please refresh both the extensions page in Chrome and the Gmail page.
+**Attention** After updating a setting, please refresh both the extensions page and the Gmail page.
 
-### Custom Domains (for GitHub Enterprise)
+#### Custom Domains (for GitHub Enterprise)
 
 If you are using GitHub enterprise and have a custom domain, you can set it in the extension options page.
 
 ![domain option](https://f.cloud.github.com/assets/1153134/2075910/2f9b1f70-8d97-11e3-9798-9afcfb550e22.png)
 
-### Mail View Shortcut
+#### Mail View Shortcut
 
 Customize the keyboard shortcut that triggers the `View on GitHub` button. Change the shortcut combination by focusing the input, and press whatever key(s) you want to be the shortcut. It will be displayed in `keyCode` which is why you see `71` here instead of `g`. Don't worry about it.
 
-#### To open and focus the new window right away (`shift + g`):
+##### To open and focus the new window right away (`shift + g`):
 
 ![image](https://f.cloud.github.com/assets/1153134/2457119/3a485f38-af2e-11e3-978a-ece296676337.png)
 
-#### To open a new window in the background (`shift + b`) – Chrome only:
+##### To open a new window in the background (`shift + b`) – Chrome only:
 
 ![image](https://f.cloud.github.com/assets/1153134/2466997/e381dbc2-afb7-11e3-9470-bc722133a265.png)
 
-### List View Regular Expression
+#### List View Regular Expression
 
 Custom Regular Expression for matching labeled Organization name. Eg. `/^\((.+)\)/` matches `muan` in `(muan)\github-gmail`, and will be use to build the url: `https://github.com/`**`muan`**`/github-gmail/issues`.
 
@@ -83,7 +82,8 @@ This is **not needed** if all you need is triggering the action button.
 
 ## Code
 
-All the core functions are written in `src/inject/inject.js`.
+Chrome: `chrome/src/inject/inject.js`.<br>
+Firefox: `firefox/data/index.js`.
 
 ## The End