Firefox is popular and most successful because of its ability to customize and add more features to the browser through add-ons.Currently Google Chrome, Safari,IE ,Opera (Opera 11 alpha)supports extensions. Except for Chrome and Firefox lot of users doesn’t file type of Opera and Safari extensions, So I compiled a short list of current browsers extensions files formats.
Browser extensions file types
| Extension | File type |
| File extension xpi | Firefox browser extension |
| File extension crx | Google Chrome extension |
| File extension oex | Opera browser extension |
| File extension safariextz | Safari browser extension |