Hey justyna666. I work for 1Password, and we're actively battling this glitch with a number of users. Since it's not specific to 1Password, it's proving hard to find a solution, but one of my colleagues and I might have found one — if you have the problem again, can you go to Safari > Preferences > Extensions, then navigate to a different pane (e.g., Advanced), and then back to Extensions? With any luck, your checkboxes might be enable-able now. Please let me know. 🙂
If you're interested, you can probably break things again, too, and let me know if the solution above works.
- Disable your extensions in Safari
- Select another Preferences pane (I chose Security)
- Quit Safari without closing preferences
- Launch Safari.
- Open Preferences.
- Attempt to enable your extension of choice.