Add compatibility chart to readme

README.md

@@ -11,12 +11,25 @@ Unsure if this supports any other operating systems, feel free to test any yours
 ## Installation 💾
 
 Install like any other Firefox CSS theme.
+1. Check for compatibility issues in the chart below.
+2. Open `about:config`
+3. Set `toolkit.legacyUserProfileCustomizations.stylesheets` to true
+4. Open `about:profiles`
+5. Click `Open Folder` next to the root directory of your currently selected profile.
+6. Copy the `chrome` folder from this repository into your Firefox profile folder.
+
+|Firefox Version|Supported?|
+|:--------------|:--------:|
+|Latest         |✅        |
+|115esr         |✅        |
+
+|Operating System|Supported?  |
+|:---------------|:----------:|
+|Windows 11      |✅          |
+|Windows 10      |✅          |
+|MacOS           |Probably Not|
+|Linux           |Maybe       |
 
-1. Open `about:config`
-2. Set `toolkit.legacyUserProfileCustomizations.stylesheets` to true
-3. Open `about:profiles`
-4. Click `Open Folder` next to the root directory of your currently selected profile.
-5. Copy the `chrome` folder from this repository into your Firefox profile folder.
 
 ## Issues 🪲 | Feature Requests 📝