User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 (.NET CLR 3.5.30729) Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2 (.NET CLR 3.5.30729) It isn't possible to merge the paragraphs by pressing the delete key at the end of a paragraph. This uses to work in previous builds of Firefox but it's failing in 3.5.2 it seems also to work in the nightly build. Reproducible: Always Steps to Reproduce: 1. Open attached test case. 2. Place the caret after the text. 3. Press delete key. 4. Observe that the delete doesn't merge the two paragraphs. Actual Results: Delete key doesn't do anything. Expected Results: Should merge the paragraphs/lines. In other words do something useful.