So this is what I did:
Searched for likely cookie in "Cookies on Computer" list - couldn't find one so:
Deselect (Untick) all items in Chrome Settings Capture list
Run Custom Clean
Nothing in Chrome got cleaned - issue does not occur (ie Extension works correctly)
Reactivate (Tick) Internet Cache and Internet History
Run Custom Clean
Appropriate items in Chrome got cleaned - issue does not occur (ie Extension works correctly)
Reactivate (Tick) Internet Cache and Internet History AND Download History and Last Download Location
Run Custom Clean
Appropriate items in Chrome got cleaned - issue does not occur (ie Extension works correctly)
Reactivate (Tick) Internet Cache and Internet History AND Download History and Last Download Location AND Session
Run Custom Clean
Appropriate items in Chrome got cleaned - issue OCCURS (ie Extension missing from Context Menu)
Removed and readded Keep to Text Fragment Extension
Closed and reopened browser - Extension works correctly
Reactivate (Tick) Internet Cache and Internet History AND Download History and Last Download Location AND Cookies
Leave Session UNticked
Run Custom Clean
Appropriate items in Chrome got cleaned - issue does not occur (ie Extension works correctly)
Run Custom Clean again (just to crosscheck)
Appropriate items in Chrome got cleaned - issue does not occur (ie Extension works correctly)
Reactivate (Tick) Internet Cache and Internet History AND Download History and Last Download Location AND Cookies AND Session
ie back to my original configuration
Run Custom Clean again
Appropriate items in Chrome got cleaned - Appropriate items in Chrome got cleaned - issue OCCURS (ie Extension missing from Context Menu)
Removed and readded Keep to Text Fragment Extension
Closed and reopened browser - Extension works correctly
Left all items activated ie staying at my original configuration
Run Custom Clean again
Appropriate items in Chrome got cleaned - Appropriate items in Chrome got cleaned - issue OCCURS (ie Extension missing from Context Menu)
Removed and readded Keep to Text Fragment Extension
Closed and reopened browser - Extension works correctly
Left all items activated EXCEPT Session
Run Custom Clean again
Closed and reopened browser - Extension works correctly
*** Conclusion: Something in "Session" is the culprit ***
===============================================
According to this website:
-
Session – You can save the session and reopen it at a later time. Your Session contains all saved and opened tabs, so cleaning it will remove these tabs.
I confess I do not understand why this should cause the issue as I also don't understand where the Session information is stored, and what the practical effect(s) of clearing or not clearing it is / are.
Can anyone enlighten me please.