[Performance Issue] Wezterm wiki slowdown on both firefox and chromium-based browsers

### Prerequisites

- [x] I [searched for any existing report](https://github.com/darkreader/darkreader/issues?q=is%3Aissue) about this performance issue to avoid opening a duplicate.
- [x] I have restarted the web browser to check if that resolved this performance issue.
- [x] I can reproduce this performance issue in a new, unmodified web browser profile with Dark Reader installed as the only extension.

### Performance Issue Description

Across the wezterm wiki

Testing on Arch Linux in latest Vivaldi, this jumps memory usage by about 1 GB when opening the page, in one instance jumped from 8 GB to 12 GB(!) then 9.5 GB memory usage with CPU fans ramping up, this did not happen consistently however.

But, it consistently causes severe, website-breaking performance issues across the wezterm wiki on both browser platforms

The page completely froze multiple times while recording the linked performance profile; it popped up the banner that DarkReader is slowing down the browser (stop/debug buttons) 3 separate times

### Website Address

https://wezterm.org/config/lua/keyassignment/index.html

### Steps To Reproduce

1. open wezterm wiki (config sections)
2. disable website dark mode, which I don't think was on by default? on the navbar, so it shows a sun, not a moon
3. browse / force refresh page with Ctrl+F5 / etc.

### Performance Profile

https://share.firefox.dev/44TAjsG

### Screenshots

_No response_

### Operating System

Arch Linux 6.15.8-arch1-1

### Web Browser name and version

Librewolf 141.0-1; Vivaldi 7.5.3735.56 (Stable channel) stable (64-bit)

### Dark Reader version

4.9.110

### Does this happen when Dark Reader is disabled?

No

### Does this happen in other web browsers?

Yes

### Additional Context

_No response_