The Opera sitepatch team just released a new update to browser.js, and guess what? Facebook @mentions is included in the list of issues patched!
PATCH-264 Enable @mentions on Facebook. Not going to mention anything about it other than that it will be removed as soon as they fix it.
This is not a final solution to the problem, it's a small hack to make sure that all Opera users are allowed to use @mentions until Facebook decides to implement a proper solution. Please follow these simple instructions to get it working.
Opera downloads browser.js automatically once a week, but if you want to get the latest update follow these steps:
- Click the "Save" button below the setting.
- Use Help > Check for updates in Opera's menu bar.
Opera may tell you no new Opera version is available, but it will still check for a new version of the browser.js file.
Please note that this is not the "final" solution to this issue, but it's a working solution!