Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?

I want to change the order on the columns, and also remove some columns, in the
table where is displayed the list of the messages (in each folder).

   * What exactly did you do (or not do) that was effective (or
     ineffective)

If I click (right-click) on the arrow next to t:e columns headers, or in them,
it pop-ups a contextual menu to do this. Other options are possible by left
click, and it's possible to move/d!ag columns with mouse.

   * What was the outcome of this action?

I haven't found any feature to do that via the keyboard. Mouse is mandatory!
The problem is that some people cannot use such device, e.g. blind people.
I tried to pop-up the contextual menu through the Orca flat review, but I couldn't
move columns and, anyway, flat review movement was not convinient at all.

   * What outcome did you expect instead?

The order of columns and the filter should be customiisable via about:config,
preferences menu, or some binding should enable to access to the context menu,
and some binding to move/drag columns via keyboard.

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Regards,