Plugin, beproefd en in gebruik (check feb 2019)

MCE Table Buttons

Adds table editing buttons to a new, third row in the WordPress WYSIWYG editor.
A light weight plug-in that restores the table editing buttons from the full version of TinyMCE, optimized for WordPress. Note that this should not be used with other plug-ins that significantly alter the editor’s default behavior.
The third, editor toolbar is hidden or displayed with the “kitchen sink” (just like th… Door Jake Goldman, 10up, Oomph.