as adition I can add you several screenshots of the particular issue

Hi wouter1,

Would you please take a look at this thread and see if maybe something there applies to you :

https://support.mozilla.org/en-US/questions/1175296

If not; maybe you could post your question(s) here :

https://support.mozilla.org/en-US/kb/where-go-developer-support

and also see :

https://stackoverflow.com

Ok, so it is not possible to have a local domain with the TLD .dev?

wouter1 said

Ok, so it is not possible to have a local domain with the TLD .dev?

Sorry, but I know absolutely nothing about this - all I could find is this :

https://www.reddit.com/r/firefox/comments/87bm70/i_can_not_access_the_local_projects_with_dev/

But maybe someone else who does know, will see this and come up with a proper answer for you.

Unfolding the entire topic made me find the work around:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful or accepting the risk.

(2) In the search box above the list, type or paste strict and pause while the list is filtered

(3) Double-click the network.stricttransportsecurity.preloadlist preference to switch the value from true to false

thank you for the support

Good for you to have figured it out - well done !

I noticed that you marked my post as Chosen Solution, but I really don't deserve the credits.

You can rectify it by clicking on the "Undo" button to the right, and then mark your own (last) post.

Again : well done - great job !