How to increase the limit of 5 recently bookmarked folders

Hi, I saw this issue was raised several times over many years, but no solution as yet. When one adds a bookmark, firefox shows a very useful menu of the most recently added folders in the bookmark tree. It shows the last 5, but it would be wildly more useful if it could be tweaked to show 10 or 20.
Its not an about:config option due to a design decision by Mozilla, as far as I found out. And none of the bookmark addons do exactly that. There is a patch here,
"Makes the number of recent bookmarks folder to be an about:config option. "
https://bugzilla.mozilla.org/attachment.cgi?id=571412&action=edit
from the thread:
https://bugzilla.mozilla.org/show_bug.cgi?id=482027
But I don't know how can I use this piece of code? does it require recompliation of Firefox? I use Version 27 on Windows 7, 64 Bit. Will this mean I will have to recompile and re-integrate the fix every time I upgrade FF? thanks

Thank you, but it doesn't seem to work - I don't see any faint arrows and the expanded bookmark window that comes with this addon still only shows 5 most recently added folders (attached immage to clarify - I want a larger list of recently added folders, not an expanded bookmark tree)

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user10869960 wrote:
Hi,
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====================
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====================
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