diff --git a/README.md b/README.md
index 2618277..34ffd93 100644
--- a/README.md
+++ b/README.md
@@ -1,44 +1,64 @@
-
-
 # Slader Chrome Extension!
 
 * Bypass Slader's 5 solutions limit per month to college books 
 * Remove the paywall about how many solutions left
-
+- Support Browser:
+  - Chrome : 87.0.4280.141 
+  - Firefox (temporary) : 84.0.2
+- Test time : 2021/01/18
 
 # Screenshot
 
-* Before
+* Before install
 
 ![1](https://raw.githubusercontent.com/lebr0nli/slader-extension/main/sample/before1.png)
 ![2](https://raw.githubusercontent.com/lebr0nli/slader-extension/main/sample/before2.png)
 
-* After
+* After install
 
 ![3](https://raw.githubusercontent.com/lebr0nli/slader-extension/main/sample/after.png)
 
 # Usage
 
-1. Download slader-extension.zip then unzip 
+## For Chrome
+
+1. Clone(Download) slader-extension.zip from github then unzip 
 
 or use
 
-	git clone https://github.com/lebr0nli/slader-extension.git
+ git clone https://github.com/lebr0nli/slader-extension.git
 
-2. Open chrome://extensions in a new tab.
+2. Open **chrome://extensions** in a new tab.
 
-3. Enable "Developer mode" at the top-right.
+3. Enable **Developer mode** at the top-right.
 
-4. Click the "Load unpacked" button that just appeared.
+4. Click the **Load unpacked** button that just appeared.
 
-5. Select the folder **slader-bypass** in **slader-extension-main** or **slader-extension**
+5. Select the folder **slader-limit-bypass** in **slader-extension-main** or **slader-extension**
 
 6. Enjoy!
 
+## For Firefox
+
+Sorry, I can't find a good way to make firefox's users use it gracefully :(
+
+Although unverified add-on was blocked by firefox policy, you still can install it temporarily. (Need reinstall every time you restart your browser)
+
+1. Clone(Download) slader-extension.zip from github then unzip 
+
+or use
+
+ git clone https://github.com/lebr0nli/slader-extension.git
+
+2. Open **about:debugging#/runtime/this-firefox** in a new tab.
+3. Click the **Load Temporary Add-on...** button that just appeared.
+4. Select the file **slader-limit-bypass.xpi** in **slader-extension-main** or **slader-extension**
+5. Done! But need reinstall every time you restart your browser.
+
 # Warning
 
 Educational using only.
 
-Commercial using is not encouraged.
+Commercial use is not allowed.
 
 Upgrade your slader's account if you can afford :)
diff --git a/slader-limit-bypass.xpi b/slader-limit-bypass.xpi
new file mode 100644
index 0000000..0084c13
Binary files /dev/null and b/slader-limit-bypass.xpi differ