Reproducible on: Nightly 39.0a1 (2015-03-15) Affected platforms: Ubuntu 14.04 (x64), Windows 7 (x64), Mac OS X 10.9.5 Steps to reproduce: 1. Launch Firefox. 2. Make sure that Reader View and Reading List are enabled by setting the following prefs to true: * browser.readinglist.enabled * reader.parse-on-load.enabled Restart the browser to apply the pref changes. 3. Open an article with a long title - (e.g.) http://www.bbc.com/news/world-31617141. 4. Enter Reader View by clicking the associated button from the Location Bar. 5. Click the "Add to Reading List" button available on Reader View's controls bar. 6. Toggle the Reading List Sidebar and reduce its width to the minimum permitted. Expected result: No matter the length of an article's title or the width of the Reading List sidebar, the items from the Reading List sidebar are using ellipsis to show omitted characters. Actual result: Longer item titles are simply cutoff/clipped, without using ellipsis.

The P1 part of this has been handled in bug 1144382, leaving this open for the ellipsis part.

Hmm. Thought this would be as easy as adding text-overflow:ellipsis , but that seems to not be working for me. Gijs didn't have any ideas off the top of his head either.

text-overflow:ellipsis only works with single-line content in Gecko right now. The only thing that we could do is fade-out the text similar to what we had tried doing with the menu panel in Australis.