Hello @Leszek
Try this:
- update Firefox to the latest version
- test in a private window
- disable extensions/add-ons
- clear Trello site data / cache
- if needed, test with a new Firefox profile or in another supported browser to compare. Trello’s own troubleshooting guide points to exactly that kind of check for browser-specific behavior.
Troubleshooting browser issues with Trello | Trello | Atlassian Support
Common browser-related problems encountered in Atlassian products and apps | Atlassian knowledge base | Atlassian Support
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