Firefox - removing a cookie causes an error

### Please answer the following questions for yourself before submitting an issue

- [X] Filters were updated before reproducing an issue
- [X] I checked the [knowledge base](https://adguard.com/kb/) and found no answer
- [X] I checked to make sure that this issue has not already been filed

### AdGuard Extension version

4.3.46

### Browser version

Firefox 126

### OS version

Windows 11

### Ad Blocking

_No response_

### Privacy

_No response_

### Social

_No response_

### Annoyances

_No response_

### Security

_No response_

### Other

_No response_

### Language-specific

_No response_

### What Stealth Mode options do you have enabled?

_No response_

### Issue Details

Steps to reproduce:
1. Add a rule to the user rules
```adblock
||pixiv.net^$cookie=first_visit_datetime_pc
```
2. Open `pixiv.net` in FF
3. Login - account is required
4. Logout
5. There is an error like in the report.

### Expected Behavior

No error as in Chrome.

### Actual Behavior

There is an error that prevents to see the login page.

### Screenshots

Screenshot 1

### Additional Information

https://github.com/AdguardTeam/AdguardFilters/issues/180178