Hovering mouse over bookmark link in sidebar (FF 20.0.1) shows information on bookmark 1 above
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I received an email from a user who corrected this problem by setting layout.css.devPixelsPerPx to 1.0. The side effect is that your menu and toolbar area fonts become small. The best workaround for that is to install the Theme Font & Size Changer extension, then click the A icon it adds at the right end of the Navigation Toolbar and adjust the font size from "Normal" to 15 or maybe a bit higher, depending on your preference.
For anyone not familiar with the High DPI support added in Firefox 22, changing layout.css.devPixelsPerPx from its default value of -1.0 to 1.0 changes the scaling of pages from your Windows DPI setting (e.g., 125%) to 100% (similar to earlier versions of Firefox). Apparently there is a bug related to the tooltips for the bookmarks sidebar. I haven't searched the bug system to see whether it has been reported, but I'm attaching some screen shots demonstrating it -- the higher the scaling, the greater the distance between the expected tooltip and the one displayed.
Try to disable hardware acceleration in Firefox.
Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
The problem still occurs in Safe Mode?
Is the correct bookmark underlined when you hover over it or is that also off by one (i.e., the underline matches the URL)?
The underline does not match the URL. Bookmark I am hovering over is underlined, but the information shown matches the bookmark 1, or sometimes 2, bookmarks above.
Also reported here: Placing the cursor on a bookmark causes the text box to show the properties of a bookmark 5 lines hi... (unsolved)