Annoying error box keep popping up at "Issues for all projects" webpage

Projet:Web
Composant:Main
Catégorie:Rapporter un bogue
Priorité:minor
Attribué:Non assigné
Statut:active
Description

At webpage "Issues for all projects" ( https://trisquel.info/en/project/issues and also the same page in a different language), typing any letter in the "Project" textbox will cause a modal dialog box to show up with the following message:

An HTTP error 0 occurred.
http://trisquel.info/?q=en/project/autocomplete/issue/project

mer, 04/06/2016 - 18:23

Additional information: observed with Firefox 45.0.1