Hugo server serves old files

The hugo server command serves me old files that were in my project folder. In particular, I have a layouts/_default/list.html template, whose content is only I'm the list template. After I delete this file, running hugo server again shows me I'm the list template again. I at first thought it was a cache problem, then I deleted it and the problem disappeared, but this didn’t work a second time. I’m using Mozilla Firefox last version. Using Safari the problem doesn’t occur. Do you know which could be the cause of the error using Firefox?

Your question can only be guessed at. For answers, please follow the support forums requesting help guidelines.

Try a different browser. If the file doesn’t show up, it’s browser cache.

You’re right, I’m sorry. I edited the question.

https://support.mozilla.org/en-US/kb/how-clear-firefox-cache