Mozilla revealed in mid-2018 that it had plans to improve the handling of different interface languages in the Firefox web browser.
Firefox supported two options back then to change the language of the browser's interface: download and install language packs, or re-install Firefox using the installer of the desired language.
Both options were inferior to how Google Chrome handled language changes. Chrome users can change the interface language directly in the browser without the need to install a language pack or re-install the entire browser.
The release of Firefox 65 improves how Firefox users may change the browser's interface language. Mozilla integrated language switching options directly to the Firefox settings.
Firefox users may still download a different language version of the web browser and install it over the current installation to change the language, but they don't have to if they run Firefox Beta or Stable.
Firefox Nightly is excluded because strings change frequently in the browser.
The preference intl.locale.requested determines the priority of languages in Firefox. The preference is only available if two more more languages are installed in the browser.
Mozilla hopes to improve the process further in future versions of the Firefox web browser. One possibility that is discussed currently is to complete the migration to Fluent; this would enable restartless language switching and support for non-English fallback locales. Firefox falls back to English automatically if a string is missing from a language file.
The new language changing options in Firefox 65 improve the process significantly. Everything that is needed is included in Firefox or downloaded automatically from that version of the browser on.
While the total number of Firefox installations that have their interface language changed is unclear, it does not appear that uncommon of an operation.
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