Robot opens Firefox URL using English by default

Hello ,
I developed my code to scrap screens redacted in French ( the website APP canva is french ). After a recent uPdate of firefox browser , when the robot opens the website App, it found it in English instead of French . So , it can t find selectors on the page.
I turn the language of the browser in French . It works if i executed manually , I find the website App french version but still if the robot is opening the website APP the caneva is still in English !!!

Please help !!!

@wafa_kacem1 is the site public? Can I know the details? Thanks

Ìt`s private Firefox application .Firefox webdriver isn t installed on the Firefox (english version ).I changed properties of Open browser : Instead of using WebDriver , I m using Native mode for now.Problem is solved , thank you ¦