The custom theme is applied to the browser after clicking the “Nope” button from the "Do you want to apply this custom theme?" pop-up

[SoftVision-SimonaRosu]

[Affected versions]:

• Firefox Nightly 94.0a1 (Build ID: 20211003201113)
• Firefox Beta 93.0b9 (Build ID: 20210923190449)
• Firefox Release 92.0.1 (Build ID: 20210922161155)

[Affected Platforms]:

• Mac 11.5.2
• Windows 10 x64
• Ubuntu 20.04 x64

[Prerequisites]:

• Have the latest Firefox Nightly browser installed.
• Have 2 Firefox profiles with the Firefox Color addon installed.

[Steps to reproduce]:

1. Open the Firefox browser with a profile from prerequisites.
2. Click on the Firefox Color toolbar button.
3. Make some changes to the page and click on the “Share” button.
4. Click the "Copy" button.
5. Open the second Firefox profile from the prerequisites and navigate to the copied link.
6. Click on the “Nope” button from the pop-up and observe what happens.

[Expected result]:

• The custom theme is no longer applied to the browser.

[Actual result]:

• All the changes are still previewed.

[Notes]:

• This issue is no longer reproducible after restarting the browser if the tab with the shared link was closed.
• Attached is a screen recording of the issue.