[#47300] - [6.0] TinyMCE flashing and losing focus constantly
- Closed
- 4 Mar 2026
- Medium
- Build: 5.4-dev
- # 47300
What happened?
- Install fresh Joomla
- Open the site in Firefox
- Go to create a new article
Version
6.0
Expected result
The editor is usable and functional.
Actual result
The editor is constantly flashing and losing focus, making editing impossible
System Information
Joomla! Version : Joomla! 6.0.3 Stable [ Kuimarisha ] 17-February-2026 16:00 UTC
PHP Version : 8.4.18
User Agent : Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:149.0) Gecko/20100101 Firefox/149.0
Additional Comments
This started occurring after a recent Firefox update, but since I don't update often, I'm not sure when exactly it started. The console doesn't display any errors or warnings at all.
I have tested this in other browsers, and thus far only Firefox is having this issue. I also checked the TinyMCE site in the same browser, and the editor works properly there, so the issue is either a Joomla script and TinyMCE script reacting weirdly together in this version of Firefox, or an older version of TinyMCE being used breaks in this version of Firefox.
Edit : Installed a fresh copy of Joomla 6 to check if the bug occured there as well, and can confirm it does.
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joomla-cms-bot
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| Status | New | ⇒ | Closed |
| Closed_Date | 0000-00-00 00:00:00 | ⇒ | 2026-03-04 15:52:45 |
| Closed_By | ⇒ | HLeithner |
Duplicate: #47238
More Information: https://manual.joomla.org/migrations/54-60/known-issues/6.0.3/
Fix:
5.4.3: https://downloads.joomla.org/cms/joomla5/5-4-3
6.0.3: https://downloads.joomla.org/cms/joomla6/6-0-3
See here please:
#46889
https://brian.teeman.net/joomla/975-joomla-tinymce-firefox-fix
This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/47300.