If we press back button quickly browser is quitting by giving Segmentation fault error release M18
Which back button.. Is this bug filed about the editor or the browser? Does it happen in browser only when editor is open? What do you mean by "quick"? Do you mean if you hit it several times successively? Or while a page is loading? Please include a little more about what you do and where, when this happens. A guide to creating really useful bug-reports is found at http://www.mozilla.org/quality/bug-writing-guidelines.html
why is this an editor bug?
m18 is old, there are newer releases and nightlies. Self-built cvs from today, no matter how fast i press back, no crash.