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Interim TinyMCE Firefox fix available for Joomla 5 and 6
An official interim patch is available for a TinyMCE blinking problem affecting content editing in Firefox on Joomla 5.4.3 and 6.0.3. The fix replaces two JavaScript files and is scheduled to become part of the next Joomla release.
The issue appears while editing content with the TinyMCE editor in Firefox, where the editor interface may visibly flicker. The workaround is intended for sites running the affected Joomla versions and can be applied before the permanent change reaches a Joomla release.
Files and installation path
The patch is hosted in the tinymce-firefoxfix GitHub repository. The download must match the Joomla version installed on the site. After extracting the archive, the following files should be uploaded:
tinymce.jstinymce.min.js
Both files replace the existing versions in:
/media/plg_editors_tinymce/js
The version requirement is important because the workaround is provided for the corresponding Joomla release. Using a fix intended for a different version may not be appropriate, so the downloaded files should be checked before replacement.
The repository contains the official patch that is expected to be included in the next Joomla release. Until that release is available, replacing the TinyMCE files provides the interim correction for the Firefox blinking behaviour reported on Joomla 5.4.3 and 6.0.3.