Spamming syslog on Ubuntu

### 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

4.4.49

### Browser version

Waterfox 6.5.5

### OS version

KDE Neon

### Ad Blocking

AdGuard Base filter

### Privacy

_No response_

### Social

_No response_

### Annoyances

_No response_

### Security

_No response_

### Other

Filter unblocking search ads and self-promotion

### Language-specific

AdGuard German filter

### What Tracking protection options do you have enabled?

_No response_

### Issue Details

Steps to reproduce:
1. Install waterfox and extension
2. View journalctl

Log gets spammend with:
Apr 01 09:28:17 pc01 waterfox[110369]: Extension error: [Exception... "Component returned failure code: 0x80070057 (NS_ERROR_ILLEGAL_VALUE) [nsIDOMWindowUtils.addSheet]" nsresult: "0x80070057 (NS_ERROR_ILLEGAL_VALUE)" location: "JS frame :: resource://gre/modules/ExtensionCommon.sys.mjs :: runSafeSyncWithoutClone :: line 61" data: no] undefined 61
Apr 01 09:28:17 pc01 waterfox[110369]: [[Exception stack
Apr 01 09:28:17 pc01 waterfox[110369]: runSafeSyncWithoutClone@resource://gre/modules/ExtensionCommon.sys.mjs:61:12
Apr 01 09:28:17 pc01 waterfox[110369]: inject/cssPromise<@resource://gre/modules/ExtensionContent.sys.mjs:594:36
Apr 01 09:28:17 pc01 waterfox[110369]: Current stack
Apr 01 09:28:17 pc01 waterfox[110369]: runSafeSyncWithoutClone@resource://gre/modules/ExtensionCommon.sys.mjs:72:37
Apr 01 09:28:17 pc01 waterfox[110369]: inject/cssPromise<@resource://gre/modules/ExtensionContent.sys.mjs:594:36
Apr 01 09:28:17 pc01 waterfox[110369]: ]]

### Expected Behavior

No error...

### Actual Behavior

Log gets spammend every second.

### Screenshots

Apr 01 09:28:17 pc01 waterfox[110369]: Extension error: [Exception... "Component returned failure code: 0x80070057 (NS_ERROR_ILLEGAL_VALUE) [nsIDOMWindowUtils.addSheet]" nsresult: "0x80070057 (NS_ERROR_ILLEGAL_VALUE)" location: "JS frame :: resource://gre/modules/ExtensionCommon.sys.mjs :: runSafeSyncWithoutClone :: line 61" data: no] undefined 61
Apr 01 09:28:17 pc01 waterfox[110369]: [[Exception stack
Apr 01 09:28:17 pc01 waterfox[110369]: runSafeSyncWithoutClone@resource://gre/modules/ExtensionCommon.sys.mjs:61:12
Apr 01 09:28:17 pc01 waterfox[110369]: inject/cssPromise<@resource://gre/modules/ExtensionContent.sys.mjs:594:36
Apr 01 09:28:17 pc01 waterfox[110369]: Current stack
Apr 01 09:28:17 pc01 waterfox[110369]: runSafeSyncWithoutClone@resource://gre/modules/ExtensionCommon.sys.mjs:72:37
Apr 01 09:28:17 pc01 waterfox[110369]: inject/cssPromise<@resource://gre/modules/ExtensionContent.sys.mjs:594:36
Apr 01 09:28:17 pc01 waterfox[110369]: ]]

### Additional Information

_No response_