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The notion of "customizer" is used very inconsistently throughout the IDE. All uses are also redundant with other means of editing information in the IDE. The HIE organization believes that "customizer" is therefore an unnecessary concept in the IDE, and our users would benefit if we got rid of this unnecessary idea. (this issue is meant as an "umbrella" issue which others will refer to).
A lot "customizers" have already been fixed, so if you find some, please report it as new issue