Steps to reproduce: 1. Create a new profile. 2. Copy `sessionstore.jsonlz4` to the new profile. 3. Start Firefox using the profile. 4. Choose Hamburger menu > History > Restore previous session. 5. Paste a URL that is already open in a restored tab. Make sure that "Switch to tab" button is shown in the dropdown. 6. Select all and drag the URL into the tab strip. A duplicate tab will open. 7. Close the tab. 8. Again paste the URL that was pasted in step 5. Actual result: "Switch to tab" is not shown. Expected result: "Switch to tab" should be shown. Regression range: https://hg-edge.mozilla.org/integration/autoland/pushloghtml?fromchange=7fafc41c9dd59ac0fe9c4a3377097a4fb926e290&tochange=0543dcc503dcc2dd5a684546e7b8b51b3d097297 Note that this bug is not reproducible with `sessionstore.jsonlz4` from the clean profile. I have a 100% reproducible `sessionstore.jsonlz4`, but I would not like to share the file because it is from my daily-use profile that has very privacy sensitive information.
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Steps to reproduce: 1. Create a new profile. 2. Copy `sessionstore.jsonlz4` to the new profile. 3. Start Firefox using the profile. 4. Choose Hamburger menu > History > Restore previous session. 5. Paste a URL that is already open in a restored tab. Make sure that "Switch to tab" button is shown in the dropdown. 6. Select all and drag the URL into the tab strip. A duplicate tab will open. 7. Close the tab. 8. Again paste the URL that was pasted in step 5. Actual result: "Switch to tab" is not shown. Expected result: "Switch to tab" should be shown. Regression range: https://hg-edge.mozilla.org/integration/autoland/pushloghtml?fromchange=7fafc41c9dd59ac0fe9c4a3377097a4fb926e290&tochange=0543dcc503dcc2dd5a684546e7b8b51b3d097297 ~~~Note that this bug is not reproducible with `sessionstore.jsonlz4` from the clean profile. I have a 100% reproducible `sessionstore.jsonlz4`, but I would not like to share the file because it is from my daily-use profile that has very privacy sensitive information.~~~ Edit: I could reproduce the bug with the clean profile.