My Library
The Debug ID is D2070208008.
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Disabling the plugin will not affect any data stored.
I don't understand why you want to "re-download" Zotero 3.0.3. For one, you should be using 3.0.7, but then any problem you describe will not be solved by using a newer Zotero version.
Beyond that, I have a hard time following what you write - if English is not your native language, what is, it might be easier for us if you write in your own language - we can cover German, French, Spanish, Portuguese, Italian, Dutch, and if need be Russian and Japanese.
On Zotero.org, under My Library, when you are looking at your records, and trying to navigate to the next page, there are two buttons. There is a button that looks like ">" and a button that looks like ">|" Are you sure you're clicking the ">" button?? The ">|" button will take you to the last page, not the next page.
2. I really could not understand well what you were writing. That makes it harder to help. Troubleshooting tech issues are hard if they're not described in very precise terms. Many of the people providing support here recognize that this is hard for many non-native speakers and offer to read posts in their native language - and many users are thankful for that - that's why we have many threads here in German, French, Portuguese, Spanish, etc.
Let's deal with your issues one at a time, starting with this one.
The Debug ID is D235423022.
We help thousands of users a year in these forums. It's pretty clear when people aren't native English speakers, and it's often easier—for them and for us—to help them in their native languages. There's really no need to take offense.
But since you've chosen to be confrontational, refuse to accept that people who read countless forum posts a day might be having trouble understanding your question, and seem to have a bizarre sense of entitlement regarding the free tech support being provided to you, I suspect no one here has any particular interest in helping you further. I certainly don't. Best of luck.
Your opening post contains several grammatical errors, and you used some non-standard jargon (for example, the Zotero documentation uses the term "pane" instead of "toolbar" to describe the main window of the Zotero for Firefox-plugin interface). You really shouldn't be offended that these things prompted adamsmith to ask you whether you perhaps happened to be a non-native speaker of English. See also http://www.zotero.org/support/forum_guidelines#be_civil . And, as it happens, both adamsmith and I are not native speakers of English ourselves.
As for the absence of items 26 to 50, do you see these items when you are logged in into the Zotero website and visit https://www.zotero.org/dellblack/items/itemPage/2 ?