"Copy URL" button/shortcut does not respect `decodeURLsOnCopy` flag

[Bringoff]

Preliminary Checks

• I have read and understood the important section above.
• I have searched existing issues and avoided creating duplicates.
• I am not filing an enhancement request.
• I have checked that this issue cannot be reproduced on Mozilla Firefox.
• I have checked that this issue can be reproduced once I removed all my Mods and Custom CSS.

What happened?

By default, Firefox copies Unicode urls to clipboard using punycode. However, there is an about:config flag that changes this behavior, browser.urlbar.decodeURLsOnCopy. After setting it to true, if I select url in address bar and copy it from there, unicode urls are copied as-is. However, when I use Cmd+Shift+C shortcut or press Copy button to the left of the address bar, copied url still contains punycode.

Example url: https://uk.wikipedia.org/wiki/Ефект_Мандели
Cmd+C from address bar: https://uk.wikipedia.org/wiki/Ефект_Мандели
Cmd+Shift+C: https://uk.wikipedia.org/wiki/%D0%95%D1%84%D0%B5%D0%BA%D1%82_%D0%9C%D0%B0%D0%BD%D0%B4%D0%B5%D0%BB%D0%B8

Expected behavior

Urls copied using Cmd+Shift+C shortcut don't contain punycode when decodeURLsOnCopy is enabled

Actual behavior

Urls copied using Cmd+Shift+C shortcut still contain punycode when decodeURLsOnCopy is enabled

Steps to reproduce

• Go to about:config
• Set browser.urlbar.decodeURLsOnCopy to true
• Go to https://uk.wikipedia.org/wiki/Ефект_Мандели (or any other url that contains non-ascii characters)
• Copy url using Cmd+Shift+C shortcut
• Paste copied url back into address bar
• It will look like https://uk.wikipedia.org/wiki/%D0%95%D1%84%D0%B5%D0%BA%D1%82_%D0%9C%D0%B0%D0%BD%D0%B4%D0%B5%D0%BB%D0%B8 and not https://uk.wikipedia.org/wiki/Ефект_Мандели

Screenshots and videos

Screen.Recording.2026-05-11.at.13.39.12.mov

Version

1.19.12b

What platform are you seeing the problem on?

macOS - aarch64

What component is this issue related to?

URL Bar

Relevant log output if applicable