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Problem:
If you're trying to use the language switcher on the homepage in mobile view on Firefox, but it's not displaying the flags.
Solution:
We recommend you follow these steps:
1. Navigate to WPML >> Languages > Custom Language Switcher section.
2. Click on the “Customize” button and select the “Dropdown click” option from the “Language switcher style:” dropdown.
3. Press the Save button.
Additionally, if you want the language switcher dropdown to display on hover on desktop, please add the following CSS in the custom CSS section of your theme:

@media(min-width:768px) {<br />.wpml-ls-legacy-dropdown-click li:hover ul {<br />  visibility: visible !important;<br />}<br />}

If this solution does not resolve your issue, or if it seems outdated or irrelevant to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If further assistance is needed, please open a new support ticket at WPML support forum.