# Kee fills the Browser console with messages about undefined p.sender.tab

**URL:** <https://forum.kee.pm/t/kee-fills-the-browser-console-with-messages-about-undefined-p-sender-tab/3016>\
**Category:** Kee browser extension\
**Tags:** debug\
**Created:** [July 8, 2020, 5:27pm UTC](https://forum.kee.pm/t/kee-fills-the-browser-console-with-messages-about-undefined-p-sender-tab/3016 "2020-07-08T17:27:22Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![braiam](https://forum.kee.pm/letter_avatar_proxy/v4/letter/b/e19b73/32.png) [@braiam](https://forum.kee.pm/u/braiam)\
**Post date:** [July 8, 2020, 5:27pm UTC](https://forum.kee.pm/t/kee-fills-the-browser-console-with-messages-about-undefined-p-sender-tab/3016/1 "2020-07-08T17:27:22Z")

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According to this [bug report](https://bugzilla.mozilla.org/show_bug.cgi?id=1388066) extensions shouldn’t be triggering this. I’m not sure how to identify if it’s Kee or Firefox, since Firefox now requires to install the developer version of Firefox to install unsigned extensions and my workflow makes that difficult. I noticed this because Kee was refusing to fill the form in a tab. That problem went away but the message keeps spamming, which made diagnosticing the issue confusing.

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**Author:** ![luckyrat](https://forum.kee.pm/user_avatar/forum.kee.pm/luckyrat/32/10_2.png) [@luckyrat](https://forum.kee.pm/u/luckyrat)\
**Post date:** [July 8, 2020, 10:40pm UTC](https://forum.kee.pm/t/kee-fills-the-browser-console-with-messages-about-undefined-p-sender-tab/3016/2 "2020-07-08T22:40:21Z")

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That could be coming from Kee but as you guessed, problems with Firefox might be the root cause. Do you see the same behaviour with both Kee 3.2 and 3.4 (the current [beta](https://forum.kee.pm/t/beta-testing-the-kee-browser-extension/2022) version)?

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**Author:** ![braiam](https://forum.kee.pm/letter_avatar_proxy/v4/letter/b/e19b73/32.png) [@braiam](https://forum.kee.pm/u/braiam)\
**Post date:** [July 10, 2020, 2:37pm UTC](https://forum.kee.pm/t/kee-fills-the-browser-console-with-messages-about-undefined-p-sender-tab/3016/3 "2020-07-10T14:37:14Z")

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Still the same behavior. The message occurs every 5 seconds. I’m using firefox 78.0.1 on Debian testing.

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**Author:** ![mnaiman](https://forum.kee.pm/user_avatar/forum.kee.pm/mnaiman/32/999_2.png) [@mnaiman](https://forum.kee.pm/u/mnaiman)\
**Post date:** [July 13, 2020, 5:28pm UTC](https://forum.kee.pm/t/kee-fills-the-browser-console-with-messages-about-undefined-p-sender-tab/3016/4 "2020-07-13T17:28:12Z")

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This could be why there is tab undefined in last post of [Constant CPU usage, increasing memory usage, killing the browser](https://forum.kee.pm/t/constant-cpu-usage-increasing-memory-usage-killing-the-browser/966/23)

There is this code:  
browser.tabs.onUpdated.addListener((tabId, changeInfo, tabInfo) =\> {

```
function onFound(tabs) {
	**let tab = tabs[0];**
```

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**Author:** ![luckyrat](https://forum.kee.pm/user_avatar/forum.kee.pm/luckyrat/32/10_2.png) [@luckyrat](https://forum.kee.pm/u/luckyrat)\
**Post date:** [November 24, 2020, 4:32pm UTC](https://forum.kee.pm/t/kee-fills-the-browser-console-with-messages-about-undefined-p-sender-tab/3016/5 "2020-11-24T16:32:27Z")

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Mozilla have fixed a bug (in v84) that might have led to errors relating to tab communications failing. Will be interesting to see in future if this specific error message no longer appears.

> **[1652925 - WebExtensions are allowed to use absurdly large amounts of memory](https://bugzilla.mozilla.org/show_bug.cgi?id=1652925)**
>
> RESOLVED (rob) in WebExtensions - General. Last updated 2020-11-17.