TYPO3 Core

Same problem with firefox, several tags are unselectables, it's impossible to define a parent category, even in edition.

<div ext:tree-node-id="17" class="x-tree-node-el x-tree-node-leaf x-unselectable" unselectable="on">
  <span class="x-tree-node-indent"><img alt="" src="http://example.com/typo3/sysext/t3skin/icons/gfx/clear.gif" class="x-tree-icon"></span>
  <img alt="" src="http://example.com/typo3/sysext/t3skin/icons/gfx/clear.gif" class="x-tree-ec-icon x-tree-elbow">
  <img alt="" src="http://example.com/typo3/sysext/t3skin/icons/gfx/clear.gif" class="x-tree-node-icon [object Object]" unselectable="on">
  <input class="x-tree-node-cb" type="checkbox">
  <a hidefocus="on" class="x-tree-node-anchor" href="#" tabindex="1"><span unselectable="on">My category</span></a>
</div>

This bug is only in this field, there's no problem anywhere else in Typo3.

Same problem here. Was still running in 7.2. 7.5 is broken. No javascript errors.

I think this is a duplicate of #70630. You can find there a fix that worked for me.

Also a diplicate of #70372

Patch set 16 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/43807

Patch set 1 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/44356