Styles from previous page are retained until I reload (Instant inject mode)

[mleyen]

Description

If I navigate to an URL in an open tab, the new URL will inherit styles from the previously opened page until I reload the page or navigate further on the same domain. This only seems to happen if "Instant inject mode" is enabled.

To reproduce:

1. Make sure "Instant inject mode" is enabled in the settings
2. Install the two styles below (font change on wikipedia.org, background color change on wiktionary.org)
3. Go to https://en.wikipedia.org/wiki/Main_Page
4. Click on the "Wiktionary" link under "Wikipedia's sister projects"
5. The page should use styles from wikipedia.org instead of wiktionary.org (i.e. font change instead of background color change)
6. Click the "back" button in the browser: Wikipedia will open with Wiktionary's styles

System Information

• OS: Ubuntu 22.04
• Browser: Vivaldi snapshot 7.1.3570.29
• Stylus Version: 2.3.6 from https://github.com/openstyles/stylus/actions/runs/12778762286

Screenshots, links, CSS

URLs on the domain: wikipedia.org

body {
    font-family: "Trebuchet MS", sans-serif !important;
}

URLs on the domain: wiktionary.org

body, .mw-page-container {
    background-color: magenta !important;
}