It would be nice if you gave use the url of the page in your screenshot.

Thank you for your answer. GOOGLE CHROME and MICROSOFT EDGE run correctly, but FIREFOX bugs. The full URL of the page is the following (at the time of this page is displayed, I am connected with my Ident / pwd) :

https://www.boulanger.com/webapp/wcs/stores/servlet/BLAccountHomepageCmd?cookieIsUserLoggedIn=true&isCheckout=false&catalogId=10001&cookieHasBPlusCard=false&cookieFirstName=RICHARD&storeId=10001&mobile=false&langId=-2&isMobile=false&cookieIsPersonalAccount=true&cookieUsersId=642734175&krypto=xlSy%2FB9%2FRPRjcVcWeDd3t8GxJ7UByIELGZ8U36JyJTcFh%2FFAtGg8Tpv0epplsR6AgacXECLaQfak4UflV5KZO7BamNC%2Fiak7Bk9ZDBipmS9PJaD0fI8jQtO2eYw%2F13NA%2F5SaQAcXxezlNsHrBSujyxpJP44DgBQ0fZKaaE2UVZIIuF1DQjEt6jg35b9iW2xK8sa31mv6kWrFUBFJyVEhCApeL3gYcnshPAMJKMIXhv7YrLWwzXhoeqy7%2Fp8Lw41b0rhG0ZwCI6GhkmRpmJunsplIu1RYebCct2VQzAjkKfnkEQX9MN3wjZqz0km%2FIQWBD68rjLqEpTCGXzB%2FE92%2FDkoVic9G6wW0f9WI5a0QPijG9VPmKmjT9nnpN6aqTR2L%2BNqFctgSF7OWAYgnEkCk8R2d2IVkLGkKD9h8Ra%2FOOI2k%2Fy9fVUNsS9Lh7EfNIpakbFI9ZoVHuM9E9sETrU8pyZjDtbk0xdYcs7JE7EncoCYOOIiVUTYcFwB4Rp6ewSBkrQNVINPmb6wj%2B6AzcXnRPlqnX%2BzXBqbdUhkX9cqzRz8%3D&ddkey=https:BLAuthentication

Make sure you are not blocking content.

Start Firefox in Safe Mode {web link}

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop

Many site issues can be caused by corrupt cookies or cache.

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.

• Delete cookies to remove the information websites have stored on your computer {web link}

• How to clear the Firefox cache {web link}acking-protection-firefox-desktop

Hi, thank you very much to FredMcD and jonzn4SUSE I deleted cookies, cleared Firefox cache, then I deactivated two modules, and all is OK. Thank you, thank you, thank you and ... Merry Christmas to all of you !

. . . then I deactivated two modules, and all is OK.

What modules did you deactivate?

I deactivated the following extensions : HTTPS Everywhere and DuckDuckGo Thank you so much for your advises, FredMcD, and merry Christmas.

And Happy Holidays to you and yours.

That was very good work. Well Done. Please flag your last post as Solved Problem as this can help others with similar problems.

To FredMcD, my previous post was already posted as Solved Problem; thank you so much, and Happy Holidays to you and yours !