User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-GB; rv:18.104.22.168) Gecko/20100722 Firefox/3.6.8 ( .NET CLR 3.5.30729) Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:22.214.171.124) Gecko/2008092521 When I enter tabs they are converted to 4 spaces. When I press F8 to reformat the page, a single indent unit is 2 spaces Also, highlighting text and pressing (SHIFT+)Tab deletes it. It would be preferable to have the text indent or outdent. Reproducible: Always Steps to Reproduce: Tab-indent text, or press F8 on any code Actual Results: Newly-inserted tabs are converted to 4 spaces. F8-reformatted XUL is created with multiple sets of 2-spaces Selected text is deleted Expected Results: Tabs remain as tabs Any selected-text is block-indented Apologies for direct-emailing mark earlier! I didn't realise there was a bugs / request page.