When customizing the Add-on Bar, separators ("|") are not visible. How can I remove them?

Not only are they not visible, they're not selectable either. They /do/ appear normally (i.e., when not customizing toolbars). Running Firefox 22.0 on Linux Mint 15 (Olivia: x86-64).

Your toolbar customizations are stored in the localstore.rdf data file in your currently active Firefox profile folder. This XML-based file makes difficult reading and I don't recall seeing any good documentation on how to edit it. If you want to give it a try, please make a backup first.
If the file becomes corrupted (or more corrupted, as the case may be), you can rename or move it and Firefox will generate a new one with default settings, and you can start customizing from scratch.
With that out of the way, it actually looks as though you should be able to find and remove the separators.
<RDF:Description RDF:about="chrome://browser/content/browser.xul#'''addon-bar'''"
mode="icons"
collapsed="false"
currentset="addonbar-closebutton,stylish-toolbar-button,spring,downloads-button,'''separator''',fireshot-Capture-Button,greasemonkey-tbb,noscript-tbb,fiddlerhook-toolbar-button,status-bar" />
To give this a try:
Open your current Firefox settings (AKA Firefox profile) folder using
Help > Troubleshooting Information > "Open Directory" button
Switch back to Firefox and Exit
Pause while Firefox finishes its cleanup, then make a backup copy of '''localstore.rdf''' (e.g., localstore.0808) and open the rdf file in a text editor to find and edit the separators out of the addon bar.
When you restart Firefox, your changes should be evident.
Any luck?

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