View page source tab is seen as a duplicate (again?)

[jesus2099]

I am currently running Duplicate Tabs Closer 3.5.3 in Vivaldi 5.4.2753.51 (Stable channel) (64 bits) and view-source:https://server.com/page.html (Ctrl+U) is seen as duplicate of https://server.com/page.html as in older version: #13:

Steps to reproduce:

1. Set On duplicate tab detected to Close tab automatically
2. Set On remaining tab to Activate
3. Go to www.google.com
4. Right click
5. Click View page source
6. Observe that the 'view page source' tab is closed immediately as it is seen as a duplicate.

(Quoting @olfek from #13)