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# Greasemonkey Quick Start Guide
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Get up and running with Greasemonkey in 5 minutes!
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## Installation
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### Chrome
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1. Open Chrome
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2. Go to `chrome://extensions/`
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3. Enable "Developer mode" (top-right toggle)
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4. Click "Load unpacked"
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5. Select the `chrome` folder
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6. Done! 🎉
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### Firefox
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1. Open Firefox
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2. Go to `about:debugging#/runtime/this-firefox`
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3. Click "Load Temporary Add-on"
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4. Select `firefox/manifest.json`
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5. Done! 🎉
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## Your First Rule
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Let's create a simple rule that changes Google's background color:
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1. **Click the Greasemonkey icon** in your browser toolbar
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2. **Click "+ Add Rule"**
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3. **Fill in the form:**
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- Rule Name: `Google Dark Background`
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- Match Type: `URL contains string`
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- URL Pattern: `google.com`
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- CSS Code:
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```css
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body {
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background-color: #1a1a1a !important;
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color: #e0e0e0 !important;
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}
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```
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- Leave JavaScript blank
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- Keep Enabled checked
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4. **Click "Save Rule"**
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5. **Visit google.com** and see the dark background!
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## Testing with Test Page
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A test page is included: `test-page.html`
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1. Open `test-page.html` in your browser
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2. Create a rule:
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- Rule Name: `Test Page Alert`
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- Match Type: `Page contains element`
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- Element Selector: `#test-element-1`
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- JavaScript Code:
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```javascript
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alert('Greasemonkey is working!');
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```
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3. Reload the test page
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4. You should see an alert!
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## Common Use Cases
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### Hide Annoying Elements
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```css
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.advertisement,
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.popup-banner,
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#cookie-notice {
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display: none !important;
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}
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```
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### Change Colors
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```css
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body {
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background-color: #1a1a1a !important;
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color: #ffffff !important;
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}
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```
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### Auto-Click Buttons
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```javascript
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const button = document.querySelector('.accept-button');
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if (button) button.click();
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```
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### Add Custom Content
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```javascript
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const banner = document.createElement('div');
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banner.textContent = 'Custom banner added by Greasemonkey!';
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banner.style.cssText = 'position:fixed;top:0;width:100%;background:red;color:white;padding:10px;z-index:9999;';
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document.body.insertBefore(banner, document.body.firstChild);
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```
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## Tips
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- **Use `!important`** in CSS to override existing styles
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- **Check the console** (F12) for error messages
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- **Start simple** and test before adding complex rules
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- **Toggle rules off** if they cause problems
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- **Element selectors** can be found by right-clicking → Inspect Element
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## Troubleshooting
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**Rule not working?**
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- ✓ Is the rule enabled? (check the toggle)
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- ✓ Does the URL pattern match? (try a shorter string)
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- ✓ Does the element exist? (test in console: `document.querySelector('selector')`)
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- ✓ Did you reload the page?
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**CSS not applying?**
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- Add `!important` to CSS rules
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- Check for syntax errors
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**JavaScript not running?**
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- Check browser console (F12) for errors
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- Test code in console first
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## Next Steps
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- Read the full [README.md](README.md) for detailed documentation
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- See [BUILD.md](BUILD.md) for distribution instructions
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- Experiment with different selectors and code
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- Share your rules with others!
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## Example: Complete Rule
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Here's a complete rule that works on GitHub to highlight pull requests:
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- **Rule Name:** `GitHub PR Highlight`
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- **Match Type:** `Both URL and element`
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- **URL Pattern:** `github.com`
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- **Element Selector:** `.js-issue-row`
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- **CSS Code:**
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```css
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.js-issue-row {
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border-left: 4px solid #28a745 !important;
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background-color: #f0fff4 !important;
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}
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```
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- **JavaScript Code:**
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```javascript
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console.log('GitHub PR highlighting active');
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```
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## Help
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Need help? Check:
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- Browser console (F12) for errors
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- README.md for full documentation
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- Element inspector to find correct selectors
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Happy scripting! 🐒✨
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