User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0 SeaMonkey/2.38 Build ID: 20150923195647 Steps to reproduce: 1. Start SeaMonkey (opens by default with a single start page, Tab Bar is hidden; browser.tabs.autoHide=true) 2. Try to open a different set of web sites by doing the following: 2a. Select the URL bar, type the new URL, hit Return. 2b. In quick succession, hit Ctrl+T to open a new Tab (Tab Bar appears) and attempt to input the second URL Actual results: At Step 2b. (assuming the time between hitting Return to load the first tab and Ctrl+T to open a second tab was short enough), the first URL loads in the second tab. The first tab stays at the original page (browser start page). Sometimes, it simply doesn't happen (especially when I try to reproduce it while writing this report); so it might be related to some very precise timing issue. At times, I managed to get this behavior while SeaMonkey has been running for some time and tabs have been open; but also during confirming an URL in Tab X, opening a new one using Ctrl+T and then trying to load a second page in Tab (X+1) at the same time while Tab X finishes loading. Expected results: First tab should show the URL entered (not the start page), second tab should be empty until an URL is entered and confirmed.
I do your STR regularly & can't say I've experienced that situation. (In my case, I typically do those steps after having opened the browser from Session Restore.) Are you able to repeat the issue with all extensions disabled (Safe Mode) or in a new, clean Profile? https://forums.informaction.com/viewtopic.php?p=7045