Firefox High CPU Usage Fix 2026
## Direct Answer
To fix Firefox high CPU usage, try updating Firefox to the latest version, disabling unnecessary extensions, and adjusting performance settings. You can also try resetting Firefox, clearing cache, and checking for malware.
## Step-by-Step Guide
1. **Update Firefox**: Open Firefox, click the menu button (three horizontal lines), and select “Help” > “About Firefox”. If an update is available, click “Update to” and follow the instructions.
2. **Disable Extensions**: Press Ctrl+Shift+A to open the Extensions page. Disable any extensions you don’t need or use. Restart Firefox and check if the CPU usage is still high.
3. **Adjust Performance Settings**: Type `about:config` in the address bar and press Enter. Search for `browser.cache.memory.capacity` and set the value to a lower number (e.g., 100000). Search for `browser.cache.disk.capacity` and set the value to a lower number (e.g., 100000).
4. **Reset Firefox**: Click the menu button (three horizontal lines) and select “Help” > “Troubleshooting Information”. Click “Reset Firefox” and follow the instructions.
5. **Clear Cache**: Press Ctrl+Shift+Del to open the Clear Recent History window. Select “Everything” as the time range and check the boxes for “Cache” and “Offline Website Data”. Click “Clear Now”.
6. **Check for Malware**: Run a virus scan using an anti-virus software to check for malware that may be causing high CPU usage.
## FAQ
– **Q: Why is Firefox using high CPU?**
A: Firefox high CPU usage can be caused by outdated software, unnecessary extensions, or malware.
– **Q: Will updating Firefox fix the issue?**
A: Yes, updating Firefox to the latest version can often fix high CPU usage issues.
– **Q: Can I use multiple extensions without affecting CPU usage?**
A: Yes, but be cautious and only use necessary extensions to minimize CPU usage.
– **Q: How often should I clear cache and cookies?**
A: Clear cache and cookies regularly to prevent them from taking up too much space and affecting CPU usage.
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