Typed text is substring of older/expanded text

See example in OP.

I just updated FF to 52.x before the trouble started, please check your version.

Hi,

Oh you're talking about autocomplete/formfill/form completion , I usually turn that off (browser.formfill.enable false)

I have older version of firefox (45...) and I dont get that problem with the chatterbox form

I assume you've ruled out plugins by testing in -safe-mode?

update: I just fired up brand new 52.0.1, cannot replicate the issue

Do you experience phantom key presses with any other program?

Thank you for your help!

> I usually turn that off (browser.formfill.enable false)

Good, a last resort! :)

> I assume you've ruled out plugins by testing in -safe-mode?

Did it now, problem persists.

> Do you experience phantom key presses with any other program?

No and to be clear, It's happening only if the Chatterbox Sidebar is opened in the sidebar (sic). (i.e. you need a bookmark, like explained here Other CB Clients

When opened directly without bookmark the problem doesn't happen.

For reproduction:

• Open in sidebar!!!
• Talk something like "... test" and wait till it shows up
• Type "..." and hit TAB key to focus on [talk] button
• The content of the input box has automatically expanded to ... test (or something lexically closer in your history) even before hitting RETURN
• No dropdown was shown
• If you repeat the last steps, but with clicking on [talk] without tabbing, the effect will be the same (no dropdown, but completion appears for a second in input before being send)

I'm pushing my collegue to update his FF on his Win Box to test it there later.

Cheers Rolf
_{(addicted to the Perl Programming Language and ☆☆☆☆ :)
Je suis Charlie!}

update

I just failed to reproduce it in another instance of the same firefox but with another profile.

Giving up now, will just turn off browser.formfill.enable in about:config , I rarely need to repeat myself ;-)