Here is a quick way:
1. In Aloha browser click extensions icon in the upper right corner:
2. Next to any extension in the list click the 3-dot icon:
3. Then hit 'Remove from Aloha':
4. Confirm with 'Remove' button:
You can also:
1. Go to 'General settings':
2. Click 'Extensions':
3. Enter 'My Extensions':
4. Tap 'Remove' on any extension: