Rated 1 out of 5 stars

by J.T. on Sept. 26, 2025 ·

Loved using the tool until the update for Thunderbird 141 came. Ever since it hasn't been working. We're at 143 now and there is still no updated version, and no messaging back from the developers.

by Christopher Blum (Developer) on Sept. 26, 2025 ·

Hi, we cannot reproduce this issue with Thunderbird 143. Can you please re-install the add-on from the Thunderbird add-on store?

Rated 5 out of 5 stars

by Robin on Sept. 19, 2025 ·

Perfect if you want a complete spell checker. Be careful, it needs a network connection (many requests are made).

Rated 5 out of 5 stars

by ViperGeek on Sept. 5, 2025 ·

Thanks for the excellent add-on. Note that 8.11.2 works with Thunderbird 142.0. The developer simply must update the manifest.json:

"browser_specific_settings": {
"gecko": {
"strict_min_version": "78.0",
"strict_max_version": "142.*",
"id": "languagetool-mailextension@languagetool.org"
}
},

Rated 5 out of 5 stars

by Bert1458 on July 25, 2025 ·

please update to Thunderbird 141

Rated 3 out of 5 stars

by Firefox user 12c141 on July 24, 2025 ·

Great tool... but not working anymore at TB 141.0 (64-Bit)
:-( please update

Rated 4 out of 5 stars

by Firefox user 1f0a77 on June 1, 2025 ·

Hello there! It is a very nice app... Unfortunely it is not compatible with TB 139.0 on windows 64bit. Please update the app.

Rated 4 out of 5 stars

by Old-School on May 3, 2025 ·

Good spellchecker, and not bad at basic grammar and finding simple mistakes.

However, it struggles with punctuation a fair amount. For example, it is very annoying with its never-ending insistence that my quotation marks are not closed, when they most certainly are.

Rated 5 out of 5 stars

by Firefox user ca0077 on March 20, 2025 ·

The extension is non-intrusive and work well. LT picks up most of the mistakes and issues with spelling and grammar. However, they need to update the extension more often.

Rated 5 out of 5 stars

by uniosus on Jan. 31, 2025 ·

It is very nice to have this option. Many thanks!

Rated 5 out of 5 stars

by Firefox user 02cba1 on Dec. 5, 2024 ·

The free version that I use is really a great help, not only when I press the wrong key, but also when a sentence needs some punctuation mark. Great software!!

Rated 3 out of 5 stars

by AlainB on Aug. 22, 2024 ·

Depuis les deux dernières versions de Thunderbird, j'obtiens du lag chaque fois que je veux ouvrir un nouveau mail. Ce lag a disparu quand j'ai désactivé LT. J'espère que vous trouverez le problème et qu'il y aura une mise à jour. Merci d'avance.

Rated 5 out of 5 stars

by schlusenbach on July 28, 2024 ·

please update to thunderbird 128+

This review is for a previous version of the add-on (8.6.0). 

by LanguageTooler GmbH (Developer) on July 28, 2024 ·

We will, already working on it.

Rated 4 out of 5 stars

by Vitaly Zdanevich on July 9, 2024 ·

I have premium - but cannot login through Facebook, please fix.

This review is for a previous version of the add-on (8.6.0). 

Rated 1 out of 5 stars

by ke7zum on June 14, 2024 ·

I was excited to use this add on until I found out how inaccessible it appeared to be.
first of all the clickable items I'm suposed to be able to check, Icanot as I cannot see the state of those items. Suggeston to remidiate this would be to make those actual check boxes and have the state of the checkbox show then I click it. I would be happy to try this add on again once these accessibility issues are remediated. the plugin looks promising.

This review is for a previous version of the add-on (8.6.0). 

Rated 5 out of 5 stars

by toscha on April 28, 2024 ·

Ein großartiges Addon. Es ist unbeschreiblich viel besser als die klassischen Rechtschreibhilfen. Integration in Thunderbird ist super einfach.

This review is for a previous version of the add-on (8.6.0). 

Rated 4 out of 5 stars

by Iamkaant on Feb. 27, 2024 ·

I have the same issue as Guido3 (https://addons.thunderbird.net/en-US/thunderbird/addon/grammar-and-spell-checker/reviews/1171026/): most of the time LT add-on is frozen and shows zero mistakes even if there are misspelled words. Switching it off and on doesn't help. I couldn't determine what causes this behavior, as sometimes the addon works just fine.

My Thunderbird version is 115.7.0 (64-bit), MacOS Sonoma 14.3.1 (23D60), Apple M1 Pro.

I love LT and am willing to provide any info necessary for debugging.

This review is for a previous version of the add-on (8.3.0). 

Rated 4 out of 5 stars

by robsku on Jan. 16, 2024 ·

I originally tried Grammarly, and while it did work just fine, this doesn't nag me for money to get the full features and quite honestly just looks and feels more pleasing to use.

There may be some things Grammarly does better, like how it can try to determine the tone of your writing might feel to a reader, but honestly I'm not missing anything. Btw, I don't know if it's even available for Thunderbird, I tried both of these first in FireFox and would recommend this.

The only thing I would personally need for giving 5 stars would be Finnish language support — and a quick way to switch between the two languages I use. But I write maybe like 95-99% text on web, and even offline in English, but Finnish is still my native language, so... ;)

This review is for a previous version of the add-on (8.3.0). 

Rated 5 out of 5 stars

by Firefox user 79ecfc on Dec. 31, 2023 ·

perfect addons, now I see also rephrasing using AI. it's wonderful.

This review is for a previous version of the add-on (8.3.0). 

Rated 1 out of 5 stars

by ara on July 21, 2023 ·

stopped working after a while.

This review is for a previous version of the add-on (6.2.7). 

Rated 5 out of 5 stars

by AndrewJK on April 29, 2023 ·

Maybe they had to do something else but now suddenly I can install it on Thunderbird Beta 113.0. I am very happy. They are super responsive. This is one subscription that I am happy to pay.

This review is for a previous version of the add-on (6.2.7).  This user has a previous review of this add-on.