Possibly, but the way it worked in Firefox 3.5 was broken (code-wise) and it's fixed already in the development version. So your suggestion is effectively a request for another change.
If you care about it a lot, you could submit it separately, try to get input from the UI people, make a patch, get it reviewed and landed. Or just implement it as an extension, which should be simpler.
> Would it be worth considering to keep the "bug"
Possibly, but the way it worked in Firefox 3.5 was broken (code-wise) and it's fixed already in the development version. So your suggestion is effectively a request for another change.
If you care about it a lot, you could submit it separately, try to get input from the UI people, make a patch, get it reviewed and landed. Or just implement it as an extension, which should be simpler.