diff --git a/README.md b/README.md
index cea9aeb..92a0265 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,17 @@
 # RoPro Patcher
-This automatically patches the [RoPro](https://chrome.google.com/webstore/detail/ropro-enhance-your-roblox/adbacgifemdbhdkfppmeilbgppmhaobf?hl=en-GB) extension for you, allowing you to have `pro_tier` for free.
\ No newline at end of file
+This automatically patches the [RoPro](https://chrome.google.com/webstore/detail/ropro-enhance-your-roblox/adbacgifemdbhdkfppmeilbgppmhaobf?hl=en-GB) extension for you, allowing you to have `pro_tier` for free.
+
+## Firefox
+This currently does not support Firefox but it easily can be done manually. 
+
+- Go to where your extension is installed, usually at `%appdata%\Mozilla\Firefox\Profiles` followed by your profile name (the most recently modified folder) and finally into `extensions`. 
+- From there, find the RoPro file - for me it is named `{fbfda72b-073a-4a24-9e87-6d472b69b66f}.xpi`. 
+- Now, change the `.xpi` extension to `.zip` and extract. 
+- Next, apply the custom path patch to it. 
+- Rezip the file and change the extension back to `.xpi`. 
+- Make sure to override the old extension.
+
+## NOTE
+Chrome (and possibly other browsers) have a feature that checks the hash of the extension. This means that it will flag as corrupted. Therefore, you will have to download the extension, patch it with a custom path and use developer mode to load an unpacked extension.
+
+- an exception to this rule is Opera GX
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diff --git a/src/main.rs b/src/main.rs
index a8a194f..0a343d8 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -26,10 +26,10 @@ fn patch(path: PathBuf) {
     // Finding the things to patch
     background_contents = background_contents.replace("subscription = await getStorage(\"rpSubscription\")", "subscription = \"pro_tier\"");
     background_contents = background_contents.replace("subscription = data", "data = \"pro_tier\"; subscription = data");
-    background_contents = background_contents.replace("getStorage('rpSubscription')", "\"pro_tier\"");
+    background_contents = background_contents.replace("getStorage('rpSubscription')", "new Promise(resolve => resolve(\"pro_tier\"))");
     background_contents = background_contents.replace("await getStorage(\"rpSubscription\")", "\"pro_tier\"");
-    background_contents = background_contents.replace("setStorage(\"rpSubscription\", xhr.getResponseHeader(\"ropro-subscription-tier\"))", "setStorage(\"rpSubscription\", \"pro_tier\"");
-    background_contents = background_contents.replace("setStorage(\"rpSubscription\", subscriptionLevel", "setStorage(\"rpSubscription\", \"pro_tier\"");
+    background_contents = background_contents.replace("setStorage(\"rpSubscription\", xhr.getResponseHeader(\"ropro-subscription-tier\"))", "setStorage(\"rpSubscription\", \"pro_tier\")");
+    background_contents = background_contents.replace("setStorage(\"rpSubscription\", subscriptionLevel)", "setStorage(\"rpSubscription\", \"pro_tier\")");
 
     // Write our changes
     fs::write(background.clone(), background_contents).expect("Unable to write file contents (background.js)");