[Bug 1672139]

[Fluks-github]

I would like this feature too, it would be useful when you search
bookmarks and you wonder in what folder a bookmark is.

In a bug related to this, someone was thinking about efficiency. Does it
matter if you add a button or a context menu item, then finding the path
needs to be done only for that one bookmark when the user requests it.
SQLite has had `WITH RECURSIVE` since 3.8.3, so you don't have to do
recursion in code anymore.

```
$ time sqlite3 places.sqlite <<<"with recursive tmp(id, parent, title) as (values(0, 19006, '') union all select moz_bookmarks.id, moz_bookmarks.parent, moz_bookmarks.title from moz_bookmarks, tmp where moz_bookmarks.id=tmp.parent) select * from tmp;"
id          parent      title     
----------  ----------  ----------
0           19006                 
19006       9625        Bugs      
9625        250         Firefox De
250         168         Firefox   
168         12          Koodaus   
12          2           ATK       
2           1           menu      
1           0                     

real    0m0.004s
user    0m0.000s
sys     0m0.004s
```
I have 10568 bookmarks in this file.

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https://bugs.launchpad.net/bugs/1672139

Title:
  Add "Open Enclosing Folder" context menu to search results of
  bookmarks in the Library window (link to view/open containing folder,
  parent folder button)

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