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Firefox not picking up the locale passed through the header through selenium preferences in Linux system

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I am trying to set the Firefox language to French in Linux system using the below code(Before running the above code, I am setting the system language to fr_FR): FirefoxOptions firefoxOptions = new FirefoxOptions(); firefoxOptions.setHeadless(isHeadless); FirefoxProfile firefoxProfile = new FirefoxProfile(); firefoxProfile.setPreference("intl.accept_languages", "fr-FR"); firefoxOptions.setProfile(firefoxProfile); driver = new FirefoxDriver(firefoxOptions);

But Firefox Accept-Languages header shows just "fr" as the code.

I need Firefox to pick up both the code and the region i.e. "fr-FR".

Please help.

I am trying to set the Firefox language to French in Linux system using the below code(Before running the above code, I am setting the system language to fr_FR): FirefoxOptions firefoxOptions = new FirefoxOptions(); firefoxOptions.setHeadless(isHeadless); FirefoxProfile firefoxProfile = new FirefoxProfile(); firefoxProfile.setPreference("intl.accept_languages", "fr-FR"); firefoxOptions.setProfile(firefoxProfile); driver = new FirefoxDriver(firefoxOptions); But Firefox Accept-Languages header shows just "fr" as the code. I need Firefox to pick up both the code and the region i.e. "fr-FR". Please help.

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Maybe try the subreddit Selenium forum.