Dans mon navigateur, j’ai trop d’onglets ouverts, alors je ne trouve plus le bon document.

Dans mon navigateur literally means in my browser.

French often uses dans for something that is conceptually inside a space, container, or environment. A browser is treated like a kind of digital space, so dans sounds natural.

• dans mon navigateur = in my browser
• sur mon ordinateur = on my computer
• sur Internet = on the internet

So the idea is:

• tabs are in the browser
• the browser is on the computer

Using sur mon navigateur would sound unnatural in this context.

Here, navigateur means web browser.

So:

• un navigateur = a browser
• un navigateur web = a web browser

Examples:

• Chrome est mon navigateur préféré. = Chrome is my favorite browser.
• J’ai trop d’onglets dans mon navigateur. = I have too many tabs in my browser.

French speakers often just say navigateur when the context makes it clear they mean an internet browser.

Because French avoids having two vowel sounds next to each other here. Je becomes j’ before a word that begins with a vowel or silent h.

So:

• je ai → j’ai
• je aime → j’aime
• je habite → j’habite

This is called elision.

So j’ai is simply the correct shortened form of je ai, and je ai is not used in standard French.

After expressions of quantity like trop de, French uses de (or d’ before a vowel), not des.

So:

• trop d’onglets = too many tabs
• beaucoup de documents = a lot of documents
• assez de temps = enough time

Because onglets begins with a vowel, de becomes d’:

• de onglets → d’onglets

So trop d’onglets is the normal and correct form.

In this sentence, un onglet means a tab, as in a browser tab.

But the word can also mean other kinds of tabs or small flaps, depending on context.

For example:

• un onglet de navigateur = a browser tab
• un onglet dans un classeur = a tab in a binder
• les onglets d’un menu = the tabs in a menu/interface

So the basic idea is a tab, and the exact meaning depends on the context.

Ouverts agrees with onglets.

• onglet is masculine singular
• onglets is masculine plural

So the adjective/past participle used like an adjective must also be masculine plural:

• un onglet ouvert = an open tab
• des onglets ouverts = open tabs

In j’ai trop d’onglets ouverts, ouverts describes the tabs: they are open.

This structure is very common in French:

• J’ai les fenêtres ouvertes. = I have the windows open.
• Elle a les yeux fermés. = She has her eyes closed.

So ouverts is not there because of the verb avoir itself; it is there because it describes onglets.

French adjective placement is different from English. Many adjectives come after the noun, and ouvert is one of them in this kind of literal meaning.

So:

• des onglets ouverts = open tabs
• une porte ouverte = an open door
• des fenêtres ouvertes = open windows

English usually puts adjectives before the noun, but French often puts them after.

That is why open tabs becomes onglets ouverts, not ouverts onglets.

This is an important nuance:

• beaucoup de = a lot of / many
• trop de = too much / too many

So:

• J’ai beaucoup d’onglets ouverts. = I have a lot of tabs open.
• J’ai trop d’onglets ouverts. = I have too many tabs open.

Trop de suggests a problem: the amount is excessive.

In this sentence, that matters because having too many tabs open causes the speaker not to find the right document.

Here, alors means something like so, therefore, or as a result.

It links the two ideas:

1. I have too many tabs open.
2. As a result, I can’t find the right document anymore.

So:

• ..., alors je ne trouve plus... = ..., so I no longer find...

Depending on context, alors can also mean then, but here it clearly has a result/consequence meaning.

Ne ... plus means no longer, not anymore, or no more.

So:

• je trouve = I find
• je ne trouve plus = I no longer find / I can’t find anymore

In this sentence:

• je ne trouve plus le bon document = I can’t find the right document anymore

This is a very common negative structure in French.

Examples:

• Je ne fume plus. = I don’t smoke anymore.
• Elle ne travaille plus ici. = She no longer works here.
• Nous n’avons plus de pain. = We have no more bread.

In everyday spoken French, people often drop ne:

• Je trouve plus le bon document.

But in standard written French, ne ... plus is preferred.

Because plus and pas do not mean the same thing.

• ne ... pas = not
• ne ... plus = no longer / not anymore

Compare:

• Je ne trouve pas le bon document.
  = I am not finding the right document.

• Je ne trouve plus le bon document.
  = I can’t find the right document anymore / no longer.

In the sentence you gave, plus suggests that the speaker used to be able to find it, but now, because there are too many tabs open, they can’t anymore.

In je ne trouve plus, plus usually means no longer, and the final s is normally not pronounced.

So it sounds roughly like plu.

That gives:

• je ne trouve plus ≈ zhuh nuh troov plu

But pronunciation of plus can vary depending on meaning and context, so learners often find it tricky. In this sentence, the safest rule is:

• ne ... plus meaning no longer → usually pronounce it plu

Here, bon means right, correct, or the one I want.

So:

• le bon document = the right document

French often uses bon / bonne in places where English uses right.

Examples:

• Ce n’est pas le bon numéro. = That’s not the right number.
• Tu as pris le bon train ? = Did you take the right train?
• Voici la bonne réponse. = Here is the right answer.

So bon does not necessarily mean good here in the sense of quality. It means correct or the intended one.

Because some common French adjectives often come before the noun, and bon is one of them.

So:

• le bon document
• une bonne idée
• un petit problème
• un grand jour

This is one of the patterns learners need to get used to: some adjectives are usually placed before the noun, while many others come after it.

So even though French says:

• des onglets ouverts
  it also says:
• le bon document

Both are normal; the adjective just belongs to a different placement pattern.

Yes, that is possible, and it would slightly change the nuance.

• trouver = to find
• retrouver = to find again / to get back / to locate again

So:

• je ne trouve plus le bon document
  = I can’t find the right document anymore

• je ne retrouve plus le bon document
  = I can’t find the right document again / I can’t locate it anymore

With computer files or documents, retrouver can sound very natural because the idea is often that you are trying to find something you had already seen before.

Still, trouver is completely correct and natural in your original sentence.

It could, but it means something slightly different and sounds a bit heavier.

• je ne trouve plus = I no longer find / I can’t find anymore
• je ne peux plus trouver = I can no longer find / I’m no longer able to find

The version with pouvoir emphasizes ability more directly. The original sentence is more natural and simpler in everyday French.

So French often prefers:

• je ne trouve plus...

rather than:

• je ne peux plus trouver...

when the meaning is clear from context.

Yes. Some possible alternatives are:

• donc = so / therefore
• du coup = so / as a result / because of that (more informal)
• c’est pourquoi = that is why

Examples:

• ..., donc je ne trouve plus le bon document.
• ..., du coup je ne trouve plus le bon document.
• ..., c’est pourquoi je ne trouve plus le bon document.

Your original alors is natural and clear. It is a good everyday connector.

It is mostly neutral everyday French.

Nothing in it is very formal or very slangy. It sounds like something a person would naturally say in conversation or write in a normal message.

A few notes:

• j’ai is standard
• alors is neutral
• je ne trouve plus is standard written/spoken French

In casual speech, a French speaker might say:

• Dans mon navigateur, j’ai trop d’onglets ouverts, alors je trouve plus le bon document.

That version drops ne, which is very common in speech, but your original sentence is the safer standard form for learners.