Firefox 140.0 ESR support?

Hey,

Pawel from the TestComplete product team here 👋 Just a quick update — support for the latest Firefox versions is coming soon!

We’ve had issues supporting Firefox versions above 115 for a while now. Over the past few months, we’ve been completely rewriting how Firefox support works under the hood. The good news is: the new approach is almost ready, and we plan to release it publicly this quarter.

Once it’s out, we’ll update the documentation and, of course, include the details in our release notes.

In current TC versions all FF versions above 115 will not work.

Best regards,
Pawel

TestComplete supports Mozilla Firefox 91 - 115.10 ESR, 94 - 116 (both 32- and 64-bit versions), as mentioned here https://support.smartbear.com/testcomplete/docs/app-testing/web/supported-browsers/index.html

According to the official documentation (https://support.smartbear.com/testcomplete/docs/app-testing/web/supported-browsers/index.html), TestComplete does not yet support Firefox ESR 140. You’re free to try it out, but you may encounter issues that won’t be officially addressed until compatibility is added.

Based on SmartBear’s past cadence—typically delivering new ESR support within 4–12 weeks of the ESR release (Firefox ESR 140 went live June 24, 2025)—I’d estimate official support arriving around October 2025.

To help accelerate this, please open a support ticket with SmartBear and stress your urgency. High-demand versions often move up the roadmap.

Note: This reply was drafted with AI assistance and references only official SmartBear TestComplete documentation.

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These release notes state:

Extended support for Firefox browsers. TestComplete now supports all current and future versions of Firefox. There's no need to wait for compatibility updates anymore - TestComplete will automatically work with new Firefox releases as they become available.

https://support.smartbear.com/testcomplete/docs/ver-15-77/general-info/whats-new.html

This Supported Browsers page still states:

Mozilla Firefox 91 - 115.10 ESR, 94 - 140 (both 32- and 64-bit versions)

https://support.smartbear.com/testcomplete/docs/app-testing/web/supported-browsers/index.html 

When I try using Firefox 140ESR TestComplete still does not see objects.

Has anyone else had any success using newer Firefox versions? In particular the ESR branch?

It should work fine unless there is something specific to 140.0 ESR you are testing.  I am not sure how frequently the supported release lists are updated by SmartBear.  As you likely know  Firefox ESR 102.0.1 is the last release listed.


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Has anyone else here seen other reports of object spy issues.  I would send a ticket into support.  Maybe something needs to be patched?

Quote:

Object Spy is unable to identify any objects inside the 140.0ESR browser.