Note: v1.0.7 was release an hour ago but it has a bug that was affecting fast computers.
Release Notes - v1.0.7
* Sometimes clicking on thumbnails would open the tab within the iframe
* Adds support for about:newtab document changes made in FF31
* Improved the tab feature when search box is visible, if press tab when focused in URL bar it will go straight to search box
Release Notes - v1.0.8
* Fixed a bug where on fast computers, on inital page load, the target of the thumbnails wouldn't be set to _parent ONLY if X'ed/removed out new thumbnails that were dynamically created would get target set properly. I think this only affects fast computers.
See complete version history